refactor: enable isolatedDeclarations

[sxzz]

Description

Enable isolatedDeclarations for all packages except ui/client

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[sxzz]

All tests are passed, PTAL /cc @sheremet-va

[sxzz]

All change requests have been applied. Thank you for your thorough review. Some parts were completed by the TS language server.

[hi-ogawa]

Thanks! Can't wait for the faster build 😃

[sxzz]

Let's merge this PR first, then #7473 (there are still some issues to resolve in #7423).