docs: update package list (backport #22063)

[mergify]

Description

ref: #21429

no change required for migrations

opened cosmos/vanity#81 due to missing vanity

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Summary by CodeRabbit

• New Features

  • Updated documentation for Cosmos SDK v2, introducing new packages and enhancing existing descriptions.
  • Added new sections for "V2" packages and "Schema" for module state schemas.
  • Introduced a PostgreSQL indexer for improved state management.
  • Included SimApp v2 as a sample for the latest version.

• Documentation

  • Expanded and clarified sections on Core, UX, and Utilities, along with package updates.

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This is an automatic backport of pull request #22063 done by [Mergify](https://mergify.com).

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