Additional Filter Operators

**Is your feature request related to a problem? Please describe.**
I'm working on an internal reporting tool and wondered about the filter operators. First of all we would like to have a `inNumberRange`/`notInNumberRange` to allow an easy filter like "invoices with a gross value between x and y" similar to the `inDateRange` variants. Also we would like to have a `afterOrEqualDate` (`>=`) as a variant of `afterDate` (`>`) that includes the given date in the range.

While we could reproduce the number range with the given operators `gt`, `gte`, `lt`, `lte` and the logic `and`/`or`, at the moment there is no easy way to have a `>=` check with dates.

**Describe the solution you'd like**
While reading the documentation about filter operators my first thought was why there are the `beforeDate` and `afterDate` operators at all. As far as i can tell those are just `lt` and `gt` with a fancy name. It would be awesome to just be able to use `gt`, `gte`, `lt`, `lte` for dates as well as numbers, and having a new `[not]between` operator that replaces the date range operators and can be used with number and time?