misc | CI + development environment

[aviadhahami]

This PR introduces the following new things:

• CI flows (one for pushes[will only test] and one for PR[test+lint])
• New codecov usage
• Devcontainer configuration

Updates:

• fixed some vulns (npm audit fix)
• linted

Requirements prior to approving this PR:

1. Authorize codecov to this repo (must be done by @shilomagen )

   Go to https://app.codecov.io/ and sign up; Authorize only this repo and not all of them

2. Copy the token generated by CodeCov, and create a new repository secret named CODECOV_TOKEN with its value

   Under settings -> secrets & variables -> actions -> repository secrets

[codecov-commenter]

Codecov Report

:exclamation: No coverage uploaded for pull request base (main@aa64075). Click here to learn what that means. Patch has no changes to coverable lines.

:mega: This organization is not using Codecov’s GitHub App Integration. We recommend you install it so Codecov can continue to function properly for your repositories. Learn more

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #19 +/- ## ======================================= Coverage ? 84.84% ======================================= Files ? 35 Lines ? 541 Branches ? 63 ======================================= Hits ? 459 Misses ? 73 Partials ? 9 ``` Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Shilo+Magen). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Shilo+Magen)

:umbrella: View full report in Codecov by Sentry.
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[aviadhahami]

@shilomagen make sure to make that token otherwise codecov can't see the repo :)

[aviadhahami]

(I also can't merge ;) )