More consistent handling of implicit default ports

### Is your feature request related to a problem?

Yes. Except `.explicit_port`, most public API members produce similar results for URLs w/ explicit & implicit default ports – ignoring or discarding default ports whenever irrelevant. The remaining exceptions lead IMO to inconsistent, unexpected behavior:

#### 1. `.__eq__()`

```python
>>> URL('http://github.com') == URL('http://github.com:80')
False
```

Although:

```python
>>> str(URL('http://github.com')) == str(URL('http://github.com:80'))
True

>>> URL('http://github.com').port == URL('http://github.com:80').port
True
```

This comparison behavior was already discussed in #921. https://github.com/aio-libs/yarl/issues/921#issuecomment-2324837518 closed the issue – mentioning https://github.com/aio-libs/yarl/pull/1033 as probable fix. Yet the latter only addressed `.__str__()` conversion – BTW also discarding default ports:

```python
>>> str(URL('http://github.com:80'))
'http://github.com'
```

#### 2. `.authority` & `.raw_authority`

Should only differ in encoding, right? (& should IMO follow the discarding logic as well) – yet:

```python
>>> URL('http://github.com').authority
'github.com:80'

>>> URL('http://github.com:80').authority
'github.com:80'

>>> URL('http://github.com').raw_authority
'github.com'

>>> URL('http://github.com:80').raw_authority
'github.com:80'
```

### Describe the solution you'd like

#### 1. Ignore default ports in comparisons & `.__hash__()`

#### 2. Either:

```python
>>> URL('http://github.com').authority
'github.com'

>>> URL('http://github.com:80').authority
'github.com'

>>> URL('http://github.com:80').raw_authority
'github.com'
```

Or:

```python
>>> URL('http://github.com').raw_authority
'github.com:80'
```

### Describe alternatives you've considered

None so far ... :)

### Additional context

_No response_

### Code of Conduct

- [x] I agree to follow the aio-libs Code of Conduct