Add DateTimeRangeFilter and DateRangeFilter

[franmomu]

Subject

The refactor is based on #142 and https://github.com/sonata-project/SonataDoctrineORMAdminBundle/blob/b59f9e58b8d80ec8fc2e95c5ddff507bd82b8134/src/Filter/AbstractDateFilter.php

I targeted master since there are some BC breaks, maybe this can be done in a BC way, but I don't think it's worth it since we are supposed to release 4.0 soon.

AbstractDateFilter has been refactored to support range queries, similar to the implementation of sonata-project/doctrine-orm-admin-bundle.

The option input_type has been removed since it was not used.

Prior to this change when filtering using a DateFilter or DateTimeFilter with equals type, it created a range
query internally. Now you have to use DateRangeFilter or DateTimeRangeFilter and provide a range of dates.

I am targeting this branch, because these changes break BC.

Closes #550.

Changelog

### Added
- Added `DateRangeFilter` to be able to filter by dates
- Added `DateTimeRangeFilter` to be able to filter by dates with time
### Removed
- Removed unused `input_type` option in `AbstractDateFilter`
- Removed `AbstractDateFilter:: applyTypeIsLessEqual`
- Removed `AbstractDateFilter:: applyTypeIsGreaterThan`
- Removed `AbstractDateFilter:: applyType`
### Fixed
- Fixed using `DateOperatorType::TYPE_EQUAL` type in a `DateFilter` and `DateTimeFilter`, now it filters by the exact date instead of a range.

[jordisala1991]

Thank you @franmomu