feat(grid): add FormattedValuesSortingStrategy for sorting by formatted values - master

[georgianastasov]

Closes #14442

Additional information (check all that apply):

• Bug fix
• New functionality
• Documentation
• Demos
• CI/CD

Checklist:

• All relevant tags have been applied to this PR
• This PR includes unit tests covering all the new code (test guidelines)
• This PR includes API docs for newly added methods/properties (api docs guidelines)
• This PR includes feature/README.MD updates for the feature docs
• This PR includes general feature table updates in the root README.MD
• This PR includes CHANGELOG.MD updates for newly added functionality
• This PR contains breaking changes
• This PR includes ng update migrations for the breaking changes (migrations guidelines)
• This PR includes behavioral changes and the feature specification has been updated with them

[hanastasov]

1. Use the tree-grid groupby sample

2. Add formatter to the Cntacttitle column:
   

3. Add the strategy in the class:
   public formattedValuesSortingStrategy = new FormattedValuesSortingStrategy();

   Run the sample, error is thrown in console:

This is a good ocasion to apply TDD approach :) First add a unit test for this scenario that will be failing with this error, and then add the fix.

[georgianastasov]

@hanastasov It appears that the error you're encountering is due to the fact that FormattedValuesSortingStrategy is designed to be a column-level sort strategy, not a grid-level sort strategy. Applying it at the grid level leads to the observed error because the strategy cannot properly handle the sorting logic across the entire grid context, it is particularly for columns with formatted values.

The scenario you described might differ and could be indicative of another underlying issue and further investigation into the specific implementation details might be required.

[georgianastasov]

Adding a "do-not-merge" tag to this pull request so we can accommodate the upcoming mass merges more effectively.