Native support for highly desirable date times

**Describe the bug**
A clear and concise description of what the bug is.

I find myself using these specific date times whenever I code a date time base app. Day.JS doesn't seem to have these although it's easy to implement.

**Expected behavior**
A clear and concise description of what you expected to happen.

Below is an object that contains all of these special date time stamps. It would be sweet if DayJS just had these available as read only methods.

```js

return {

current: {
day: {
start: dayjs().format('YYYY-MM-DD 00:00:01'),
end: dayjs().format('YYYY-MM-DD 23:59:59'),
},
week: {
start: dayjs().day(1).format('YYYY-MM-DD 00:00:01'),
end: dayjs().day(1).add(6, 'day').format('YYYY-MM-DD 23:59:59'),
},
month: {
start: dayjs().date(1).format('YYYY-MM-DD 00:00:01'),
end: dayjs().date(dayjs().daysInMonth()).format('YYYY-MM-DD 23:59:59'),
},
quarter: {
q1: {
start: dayjs(new Date(new Date().getFullYear(), 0, 1)).format('YYYY-MM-DD 00:00:01'),
end: dayjs(new Date(new Date().getFullYear(), 0, 1)).add(3, 'month').subtract(1, 'day').format('YYYY-MM-DD 23:59:59'),
},
q2: {
start: dayjs(new Date(new Date().getFullYear(), 0, 1)).add(3, 'month').format('YYYY-MM-DD 00:00:01'),
end: dayjs(new Date(new Date().getFullYear(), 0, 1)).add(6, 'month').subtract(1, 'day').format('YYYY-MM-DD 23:59:59'),
},
q3: {
start: dayjs(new Date(new Date().getFullYear(), 0, 1)).add(6, 'month').format('YYYY-MM-DD 00:00:01'),
end: dayjs(new Date(new Date().getFullYear(), 0, 1)).add(9, 'month').subtract(1, 'day').format('YYYY-MM-DD 23:59:59'),
},
q4: {
start: dayjs(new Date(new Date().getFullYear(), 0, 1)).add(9, 'month').format('YYYY-MM-DD 00:00:01'),
end: dayjs(new Date(new Date().getFullYear(), 0, 1)).add(12, 'month').subtract(1, 'day').format('YYYY-MM-DD 23:59:59'),
},
},
year: {
start: dayjs(new Date(new Date().getFullYear(), 0, 1)).format('YYYY-MM-DD 00:00:01'),
end: dayjs(new Date(new Date().getFullYear(), 0, 1)).add(12, 'month').subtract(1, 'day').format('YYYY-MM-DD 00:00:01'),
},

},

previous: {
day: {
start: dayjs().subtract(1, 'day').format('YYYY-MM-DD 00:00:01'),
end: dayjs().subtract(1, 'day').format('YYYY-MM-DD 23:59:59'),
},
week: {
start: dayjs().day(1).subtract(7, 'day').format('YYYY-MM-DD 00:00:01'),
end: dayjs().day(1).subtract(1, 'day').format('YYYY-MM-DD 23:59:59'),
},
month: {
start: dayjs().date(1).subtract(1, 'month').format('YYYY-MM-DD 00:00:01'),
end: dayjs().date(dayjs().daysInMonth()).subtract(1, 'month').format('YYYY-MM-DD 23:59:59'),
},
quarter: {
q1: {
start: dayjs(new Date(new Date().getFullYear(), 0, 1)).subtract(1, 'year').format('YYYY-MM-DD 00:00:01'),
end: dayjs(new Date(new Date().getFullYear(), 0, 1)).subtract(1, 'year').add(3, 'month').subtract(1, 'day').format('YYYY-MM-DD 23:59:59'),
},
q2: {
start: dayjs(new Date(new Date().getFullYear(), 0, 1)).subtract(1, 'year').add(3, 'month').format('YYYY-MM-DD 00:00:01'),
end: dayjs(new Date(new Date().getFullYear(), 0, 1)).subtract(1, 'year').add(6, 'month').subtract(1, 'day').format('YYYY-MM-DD 23:59:59'),
},
q3: {
start: dayjs(new Date(new Date().getFullYear(), 0, 1)).subtract(1, 'year').add(6, 'month').format('YYYY-MM-DD 00:00:01'),
end: dayjs(new Date(new Date().getFullYear(), 0, 1)).subtract(1, 'year').add(9, 'month').subtract(1, 'day').format('YYYY-MM-DD 23:59:59'),
},
q4: {
start: dayjs(new Date(new Date().getFullYear(), 0, 1)).subtract(1, 'year').add(9, 'month').format('YYYY-MM-DD 00:00:01'),
end: dayjs(new Date(new Date().getFullYear(), 0, 1)).subtract(1, 'year').add(12, 'month').subtract(1, 'day').format('YYYY-MM-DD 23:59:59'),
},
},
year: {
start: dayjs(new Date(new Date().getFullYear(), 0, 1)).subtract(1, 'year').format('YYYY-MM-DD 00:00:01'),
end: dayjs(new Date(new Date().getFullYear(), 12, 0)).subtract(1, 'year').format('YYYY-MM-DD 23:59:59'),
},

},

}
```

Output as of 03/10/2022:

```json
{
"current": {
"day": {
"start": "2022-03-10 00:00:01",
"end": "2022-03-10 23:59:59"
},
"week": {
"start": "2022-03-07 00:00:01",
"end": "2022-03-13 23:59:59"
},
"month": {
"start": "2022-03-01 00:00:01",
"end": "2022-03-31 23:59:59"
},
"quarter": {
"q1": {
"start": "2022-01-01 00:00:01",
"end": "2022-03-31 23:59:59"
},
"q2": {
"start": "2022-04-01 00:00:01",
"end": "2022-06-30 23:59:59"
},
"q3": {
"start": "2022-07-01 00:00:01",
"end": "2022-09-30 23:59:59"
},
"q4": {
"start": "2022-10-01 00:00:01",
"end": "2022-12-31 23:59:59"
}
},
"year": {
"start": "2022-01-01 00:00:01",
"end": "2022-12-31 00:00:01"
}
},
"previous": {
"day": {
"start": "2022-03-09 00:00:01",
"end": "2022-03-09 23:59:59"
},
"week": {
"start": "2022-02-28 00:00:01",
"end": "2022-03-06 23:59:59"
},
"month": {
"start": "2022-02-01 00:00:01",
"end": "2022-02-28 23:59:59"
},
"quarter": {
"q1": {
"start": "2021-01-01 00:00:01",
"end": "2021-03-31 23:59:59"
},
"q2": {
"start": "2021-04-01 00:00:01",
"end": "2021-06-30 23:59:59"
},
"q3": {
"start": "2021-07-01 00:00:01",
"end": "2021-09-30 23:59:59"
},
"q4": {
"start": "2021-10-01 00:00:01",
"end": "2021-12-31 23:59:59"
}
},
"year": {
"start": "2021-01-01 00:00:01",
"end": "2021-12-31 23:59:59"
}
}
}
```

**Information**
- Day.js Version [e.g. v1.0.0]
- OS: [e.g. iOS]
- Browser [e.g. chrome 62]
- Time zone: [e.g. GMT-07:00 DST (Pacific Daylight Time)]

No source file or test is named. Start by reviewing Day.js's existing API and the date-range examples in the issue, then clarify the intended method names, supported periods, boundaries, and previous-period behavior; done means those decisions are implemented and covered by tests.

Written by the indexing model from the issue text.