relative date time feature

[moxplod]

Description

Relative date time feature. We are able to do filtering such as 'date > today' or 'date > last month'

Fixes # (Relative dates feature #211)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

• I have performed a self-review of my code
• I have added tests that prove my fix is effective or that my feature works
• I have made corresponding changes to the documentation
• I have commented my code, particularly in hard-to-understand areas
• New and existing unit tests pass locally with my changes

[what-the-diff]

PR Summary

• Added ability to parse relative dates in queries

  A new method named ParseRelativeDate was incorporated into BaseQueryBuilder.cs. This method was designed to convert relative dates into actual date-time values, enhancing the software's functionality and allowing more flexibility in input formats.

• Improved handling of DateTime values

  The AddIndexerNullCheck method, also located in BaseQueryBuilder.cs, was improved to better handle DateTime values. Now, it is capable of parsing these as relative dates. This enhancement ensures accurate and reliable date-time processing within the software.

• Integration of the Chronic.Core package

  The Chronic.Core package was added to Gridify.csproj, increasing our project's capability to handle natural language dates, which greatly benefits end-user experience.

• Enhancements in testing capabilities

  The test file GridifyExtensionsShould.cs now includes two additional test methods: ApplyFiltering_DateTime and ApplyFiltering_DateTime_Relative. These methods are used to verify that the software filters based on "DateTime" values accurately. This addition ensures that our software stays robust and reliable, delivering consistent output.

[moxplod]

If the code and dependency looks good I will go ahead and add the appropriate documentation.

[moxplod]

Closing this - see comments on #211