feat(platform): split platform into libraries

[artolshansky]

Please provide a link to the associated issue.

Closes: #5912

Please provide a brief summary of this pull request.

Split platform library into multiple sub-packages.

• Libraries are built with nx instead of ng;
• All main platform modules are now built as separate sub-packages;
• Recommended way of importing files from the platform library now is following:

import { PlatformButtonModule } from '@fundamental-ngx/platform/button';

• Structure of fundamental-ngx/platform was refactored to allow splitting it into separate sub-packages;
• Platform documentation has been updated with the appropriate import paths;
• TSPath has been updated to reflect all separate submodules paths;
• root tsconfig.json has been renamed to tsconfig.base.json;
• folders from utils has been moved to a separate shared sub-package;
• each library contains own tsconfig.json file with strict mode disabled, and can be enabled on per-package basis;
• Now it is possible to launch module-specific unit tests by using nx test platform-[module-name] command

Please check whether the PR fulfills the following requirements

• the commit message follows the guideline:
  https://github.com/SAP/fundamental-ngx/blob/main/CONTRIBUTING.md
• tests for the changes that have been done
• all items on the PR Review Checklist are addressed :
  https://github.com/SAP/fundamental-ngx/wiki/PR-Review-Checklist
• [n/a] Run npm run build-pack-library and test in external application

Documentation checklist:

• update README.md
• Breaking Changes Wiki
• Documentation Examples
• [n/a] Stackblitz works for all examples

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[lgtm-com]

This pull request fixes 32 alerts when merging 2b73a8f into 52d8f88 - view on LGTM.com

fixed alerts:

• 32 for Unused variable, import, function or class

[github-actions]

This pull request is stale because it has been open 2 days with no activity. Remove stale label or comment or this will be closed in 3 days

[lgtm-com]

This pull request fixes 32 alerts when merging f919e73 into fe8a11f - view on LGTM.com

fixed alerts:

• 32 for Unused variable, import, function or class

[InnaAtanasova]

Question: Denis from my team made the split in a way that the old way is still supported. Basically both options are currently possible. Is it the case with the Platform split?

[Betrozov]

Question: Denis from my team made the split in a way that the old way is still supported. Basically both options are currently possible. Is it the case with the Platform split?

Hi @InnaAtanasova
Yes, the old way is still supported

[lgtm-com]

This pull request fixes 32 alerts when merging 15998f2 into 1db9de9 - view on LGTM.com

fixed alerts:

• 32 for Unused variable, import, function or class

[N1XUS]

@Betrozov I see some failing unit tests in core lib. Does it has something to do with the PR?

[lgtm-com]

This pull request fixes 30 alerts when merging 0bd64e7 into 3b1b52c - view on LGTM.com

fixed alerts:

• 30 for Unused variable, import, function or class

[Betrozov]

@Betrozov I see some failing unit tests in core lib. Does it has something to do with the PR?

Travis fixed