Validate field type-specific settings config schema's when those are validatable

Problem/Motivation

In the parent issue at field_config_base it was raised we need want to validatie field type specific settings, but we cant really until those al validatable.

Constraints on each of the field type-specific settings config schemas BUT extra special challenge: until Drupal 11, at best only core field types will have validation constraints set!

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

Introduced terminology

API changes

Data model changes

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