feat(db-sqlite, db-postgres, payload): add dbJsonColumn property for fields that create tables

[r1tsuu]

Adds dbJsonColumn field property - stores a field, that should create additional tables (hasMany Text / Number / Select, Array / Blocks, Polymorphic / hasMany relationships) as a json column.

Motivation: simplify migrations / raw querying, improve speed by not joining tables (while currently, with blocks you can have them a lot). In my opinion, MongoDB is better when working with unstructured data in blocks / arrays for sites.
Well, Payload docs When to choose MongoDB even says:

You leverage a lot of array fields, block fields, or hasMany select fields and similar

With this addition, will this actually be true anymore?

Prev PR (this one contains only this feature) #6983

Description

• I have read and understand the CONTRIBUTING.md document in this repository.

Type of change

• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

Checklist:

• I have added tests that prove my fix is effective or that my feature works
• Existing test suite passes locally with my changes
• I have made corresponding changes to the documentation

[github-actions]

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