monorepo: upgrade to TS 5.5, consider using `${configDir}` to DRY up `tsconfig.json`

[filmaj]

See https://devblogs.microsoft.com/typescript/announcing-typescript-5-5/#the-${configdir}-template-variable-for-configuration-files13

This would allow us to factor out all the duplicated entries in the various sub-packages tsconfig.json into a e.g. tsconfig.base.json that exists in the root of the repo, and have sub-packages extend from the base file.

[github-actions]

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