✨ Implementation of Select Expression

[enisn]

Related with #20

Files

Awaiting implementation in 2 files:

• SelectorFilterBase.cs
  https://github.com/enisn/AutoFilterer/blob/feature/select-expression/src/AutoFilterer/Types/SelectorFilterBase.cs#L14-L18

• SelectorPaginationFilterBase.cs
  https://github.com/enisn/AutoFilterer/blob/feature/select-expression/src/AutoFilterer/Types/SelectorPaginationFilterBase.cs#L10-L14

Documentation

Also, Implementation requires documentation too. Issue #20 can help to prepare documentation.

Tests

Basics tests are ready like below, but more tests are required to handle most of scenarios.

https://github.com/enisn/AutoFilterer/blob/feature/select-expression/tests/AutoFilterer.Tests/Types/SelectorFilterBaseTests.cs