Fully integrate JSON mapping into the relational model

[AndriySvyryd]

Also add FindColumn(IComplexProperty) and FindColumn(INavigation)

This would allow:

• Using it to retrieve facets:
  • [rc2] Fix transformation from JsonQueryExpression to OPENJSON #36642 (comment)
  • Json: move SqlServerValueGenerationConvention.GetValueGenerated(IConventionProperty property) JSON logic to relational #28714
• Using it for advanced mappings:
  • Support complex JSON properties with TPT/TPC inheritance mapping #28443
  • Json: add support for table splitting on the entities that own json entities #28442
  • Json: allow mapping json structure to a different column on view and on table #28584
  • Json splitting mapping? #28574
  • Support mapping multiple owned types to the same JSON column (sharing) #28592
  • Add support for JSON columns in stored procedure mapping #28593
• Add a structured path with placeholders for collection ordinals:
  • Change partial update JSON path to be be structured instead of a string JSONPATH #32185

#35314 needs to be committed first