add info to indexes to show nulls not distinct in Postgres 15

[azmy60]

fix #2115

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🚀 This description was created by Ellipsis for commit 141cb3b

Summary:

This PR adds UI support for displaying 'NULLS NOT DISTINCT' information for indexes in PostgreSQL 15 and above, enhancing detail provided about database indexes.

Key points:

• Add support for displaying 'NULLS NOT DISTINCT' for indexes in PostgreSQL 15+.
• Modify TableIndexes.vue to include this info based on DB version.
• Update PostgresClient to fetch this data when listing indexes.
• Update SupportedFeatures model to include a flag for this feature.
• Ensure feature availability only for PostgreSQL versions 15 and above.

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[rathboma]

@ellipsis-dev code review?

[ellipsis-dev]

OK! Reviewing this PR...

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[ellipsis-dev]

👍 Looks good to me! Reviewed everything up to 141cb3b in 2 minutes and 41 seconds

More details

• Looked at 289 lines of code in 13 files
• Skipped 0 files when reviewing.
• Skipped posting 1 drafted comments based on config settings.

1. apps/studio/src/lib/db/clients/postgresql.ts:409

• Draft comment:
  The conditional inclusion of 'indnullsnotdistinct' in the SELECT statement based on the Postgres version is a good approach. However, ensure that the version comparison logic (this.version.number >= 150_000) accurately reflects the versioning scheme used by Postgres and that it is tested thoroughly to handle edge cases around version boundaries.
• Reason this comment was not posted:
  Confidence of 0% on close inspection.

Workflow ID: wflow_xedrEaso5gNj7Kuj

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