[PB-6503] add new hybid encryption for bucket key

[TamaraFinogina]

Description

This PR adds new hybrid encryption functions + tests. Not used yet. Will be used by a new version of private sharing. Put in a separate PR to reduce the amount of changes.

changes:

1. Adds new hybrid functions for bucket keys (here we don't need extent, and it's uint8array already, so a bit easier)
2. Groups same code into subfunctions to reduce duplications
3. Adds missing checks
4. Switches to const functionName = () style

Related Pull Requests

Relates to Update private sharings

Checklist

• Changes have been tested locally.
• Unit tests have been written or updated as necessary.
• The code adheres to the repository's coding standards.
• Relevant documentation has been added or updated.
• No new warnings or errors have been introduced.
• SonarCloud issues have been reviewed and addressed.
• QA Passed

Testing Process

Unit tests

Additional Notes

Nothing should be changed in the existing code; extra parameters are set by default

[cloudflare-workers-and-pages]

Deploying drive-web with    Cloudflare Pages

Latest commit:	9c3a35b
Status:	✅  Deploy successful!
Preview URL:	https://7ef11c60.drive-web.pages.dev
Branch Preview URL:	https://add-new-hybrid.drive-web.pages.dev

View logs

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
89.9% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud