feat: add flow-ts package

[Lodin]

This PR adds an npm package that contains all TS/JS code used by Flow

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[mshabarov]

To be tested against workflow/usability:

pros are having proper JS/TS dev environment and good preparation for further merge of repos (if decided),

cons may be the more complex debugging/testing process for Flow developers as then they would need to additionally build npm package, link it to a testing project, also the CI/CD pipelines would need significant changes.

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
1 out of 2 committers have signed the CLA.

✅ tepi
❌ Lodin
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[mshabarov]

Let's create a ticket related to this and estimate effort needed to compile this refactoring and make changes to CI/CD against value we get after this.

[mshabarov]

Ticket created #23210.