Saving a field config clears all typed data plugin definitions

Generated with the help of an LLM.

The problem was demonstrated to me, and profiled with the help of a coding agent. These words are my own. The MR was mostly written by the agent.

Problem/Motivation

Every time a field config, field storage or base field override is saved or deleted we clear all DataType plugin definitions, both static and persistent, so the derivers for entity:* and field_item:* have to run again. Data type definitions depend on entity types, bundles and field type plugins, not on field instances, so there's no reason to clear them here.

This happens in EntityFieldManager::clearCachedFieldDefinitions(), which calls TypedDataManager::clearCachedDefinitions() to reset the cached property prototypes. That also wipes the definitions.

This came up before in #2114707-33: Allow per-bundle overrides of field definitions where @berdir said that clearCachedDefinitions() "clears way more than we're interested in". #2487287: Optimize/clean up cache clears when saving/deleting FieldConfig entities is about cleaning up the other cache clears on field config save and delete.

Steps to reproduce

• Install a site from existing config with lots of field configs, or create fields in a loop
• Count calls to EntityDeriver::getDerivativeDefinitions(), it runs again after every field save

Proposed resolution

• Add TypedDataManagerInterface::clearCachedPrototypes() that only clears the static prototypes
• Call that from EntityFieldManager::clearCachedFieldDefinitions() instead of clearCachedDefinitions()

Note this is an interface change so BC could be tricky.

Remaining tasks

User interface changes

Introduced terminology

API changes

Data model changes

Release notes snippet