feat: extensions schema entrypoint

[jacek-prisma]

TML-1411

[codspeed-hq]

CodSpeed Performance Report

Merging #5620 will not alter performance

_{Comparing feat/extensions-schema-entrypoint (509649c) with main (12b56ce)}

Summary

✅ 11 untouched

[github-actions]

WASM Query Engine File Size

Engine	This PR	Base branch	Diff
Postgres	2.190MiB	2.187MiB	3.679KiB
Postgres (gzip)	867.685KiB	866.250KiB	1.436KiB
Mysql	2.158MiB	2.154MiB	3.807KiB
Mysql (gzip)	854.559KiB	853.348KiB	1.211KiB
Sqlite	2.070MiB	2.068MiB	2.942KiB
Sqlite (gzip)	820.179KiB	819.579KiB	615.000B
SQL Server	2.129MiB	2.125MiB	3.792KiB
SQL Server (gzip)	845.602KiB	844.295KiB	1.307KiB
CockroachDB	2.213MiB	2.208MiB	4.795KiB
CockroachDB (gzip)	876.998KiB	875.232KiB	1.766KiB

WASM Query Compiler File Size

Engine	This PR	Base branch	Diff
Postgres	1.858MiB	1.854MiB	3.942KiB
Postgres (gzip)	733.236KiB	731.625KiB	1.611KiB
Mysql	1.824MiB	1.820MiB	4.629KiB
Mysql (gzip)	721.708KiB	720.583KiB	1.125KiB
Sqlite	1.782MiB	1.778MiB	3.978KiB
Sqlite (gzip)	704.235KiB	703.166KiB	1.070KiB
SQL Server	1.855MiB	1.851MiB	4.648KiB
SQL Server (gzip)	735.229KiB	733.494KiB	1.736KiB
CockroachDB	1.883MiB	1.877MiB	5.733KiB
CockroachDB (gzip)	743.171KiB	740.924KiB	2.248KiB