Split out the "fix" functionality of prisma format

[Druue]

Context

The relevant code that adds the ""fix"" functionality to format is in:

• psl-core/src/reformat::enrich

Which takes input from the three following functions:

• reformat::push_missing_fields
• reformat::push_missing_attributes
• reformat::push_missing_relation_attribute_args

Instead of automatically being applied through format, we should offer the separate ability to fix the issues this catches. We have diagnostics for two of these already (they aren't used, however, in the current implementation of fixes in format)

• missing 1:m
• missing 1:1

As this is a breaking change, we should look at the following intermediary changes first

Temporary

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1. add separate prisma fix
2. add separate prisma format-only

Tasks

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1. Discovery: how do we want to incorporate prisma fix into the CLI
2. Add any missing diagnostics
3. Update the diagnostics we use in engines to be LSP compatible
4. Offer code actions to perform the fixes that are currently done in format

Nice-to-have

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1. Add a fix-all code action

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