chore: enable new TypeScript 5.5 `--isolatedDeclarations`

[ghiscoding]

• it would be good to eventually support the new TS 5.5 --isolatedDeclarations flag, which requires explicit return type, to speed up monorepo builds, see TypeScript 5.5 RC release blog post for more info
• the isolatedDeclarations flag can be added into tsconfig.base.json but I have disabled it for now because it throws a thousand of errors, I've only slowly started to fix some of these errors
• found hasData() util to be a duplicate of isDefined() declared in the same util file, so let's remove hasData() and keep the other method
• this PR is quite large and touches nearly every single file in the project

NOTE: this PR is speed up builds but as mentioned by the TypeScript team, this will only start to happen in future iteration of TypeScript when more tools start to integrate it. However it is still good to start enabling the flag early and do the changes now.

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Codecov Report

Attention: Patch coverage is 99.92587% with 1 line in your changes missing coverage. Please review.

Project coverage is 99.8%. Comparing base (4d69bc0) to head (066124c).

Files	Patch %	Lines
packages/common/src/core/slickGrid.ts	99.6%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1567 +/- ## ======================================== - Coverage 99.8% 99.8% -0.0% ======================================== Files 198 198 Lines 21729 21725 -4 Branches 7274 7273 -1 ======================================== - Hits 21668 21664 -4 Misses 55 55 Partials 6 6 ```

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