Continuation of https://github.com/payloadcms/payload/pull/6245.
This PR allows you to pass `blocksAsJSON: true` to SQL adapters and the
adapter instead of aligning with the SQL preferred relation approach for
blocks will just use a simple JSON column, which can improve performance
with a large amount of blocks.
To try these changes you can install `3.43.0-internal.c5bbc84`.
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