feat(psl): GA fullTextIndex and fullTextSearch for provider = "mysql"

[jkomyno]

This PR:

• closes https://github.com/prisma/team-orm/issues/1329 (ORM-313)
• closes https://github.com/prisma/team-orm/issues/1327 (ORM-311)

Context: Docs.

---

We're only GA-ing fullTextSearch for provider = "mysql", but psl_core::common::preview_features::FeatureMap has no knowledge of which Prisma database provider is currently selected by the user.

Hence, I've introduced psl_core::common::preview_features::FeatureMapWithProvider::<'a>, which, given a provider, exposes the same functionality as the old FeatureMap, but allows for escape hatches when provider = "mysql".
FeatureMap is now a private struct.

I've added new validation tests to detect the different preview feature validation logic for fullTextSearch on provider = "mysql" vs provider = "postgresql". I've also removed deprecated tests for fullTextIndex.

In 8ce72a2, I've added a default implementation of FeatureMapWithProvider as a convenience for https://github.com/prisma/language-tools. Implication: the autocompletion on generator's previewFeatures' array will include "fullTextSearch" on "mysql", even though adding it would trigger a warning when running the prisma validate command.

[github-actions]

WASM Query Engine file Size

Engine	This PR	Base branch	Diff
Postgres	2.038MiB	2.038MiB	853.000B
Postgres (gzip)	818.975KiB	818.838KiB	140.000B
Mysql	2.002MiB	2.001MiB	844.000B
Mysql (gzip)	804.788KiB	804.592KiB	200.000B
Sqlite	1.901MiB	1.900MiB	853.000B
Sqlite (gzip)	765.307KiB	765.012KiB	302.000B

[codspeed-hq]

CodSpeed Performance Report

Merging #5031 will not alter performance

_{Comparing feat/ga-mysql-fulltextsearch-fulltextindex (027c45e) with main (5b155e0)}

Summary

✅ 11 untouched benchmarks