feat(server)!: pgvecto.rs 0.2 and pgvector compatibility

[mertalev]

Description

This PR upgrades the codebase to be compatible with pgvecto.rs 0.2 and future patch releases. This change is beneficial in several respects:

• It allows for searching with VBASE, a novel vector search algorithm that allows fetching an arbitrary number of rows instead of a fixed number upfront
• There have been many bug fixes as well as stability and performance improvements since the 0.1.11 release
• It makes adding and maintaining compatibility with pgvector easier
• Updating is simpler for admins as they can use any 0.2.* release, not a specific patch release
• Maintaining Immich is easier for third-party platforms as they have more freedom in the pgvecto.rs version they use
• It fixes a kernel issue with some Synology servers

Additionally, it now allows pgvector to be used instead. This is added for compatibility reasons - there are environments where pgvecto.rs simply cannot be used right now.

Summary of changes:

• Check for available extension upgrades at startup and update if possible
• Generalize vector extension code to work with both pgvecto.rs and pgvector
  • Use pgvecto.rs's pgvector compatibility mode for more code reusability between the two
• Add an env that determines which extension is used
  • Migrations are applied based on this env, so this choice cannot be changed after a successful startup
• Make parts of database startup run in a lock to prevent both server and microservices from making changes at the same time
• Add vectors to the database search path
  • pgvecto.rs now uses this schema to be able to coexist with pgvector
• Update version constraints to allow pinning to the patch/minor/major part of the minimum version

To do:

• Add more unit tests

Follow-up work:

• Refactor the vector DB code - there's some duplication and the logic is spread apart across the database and smart info repos as well as migrations
  • It might be good to move the existing dim size update and migration code all to the database repo
• Update e2e to run with both extensions to make sure we don't break pgvector
• Prepare documentation
  • The instructions in the 1.91.0 release notes will be outdated - should we consider making a page for this in the docs?
• Do more manual testing to discover possible edge-cases

Fixes #5813
Fixes #5880
Fixes #5893
Addresses discussion #5954

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[OverHash]

Should also help with #5813

[mertalev]

Should also help with #5813

Right, added that to the PR description

[danieldietzler]

Nice! I really like those new error messages for wrong installs. That's a great addition and probably helps a lot reducing support tickets related to this.

[ScrumpyJack]

Thank you so much for adding pgvector compat. Fantastic!