uplinkc: add restrict_scope function

[mniewrzal]

What: New function restrict_scope to restrict access to resources with caveat and encryption restriction. The function returns new scope with restricted api key and encryption access.

Why: We want to expose ability to restrict resource in uplinkc

based on #3705

Please describe the tests:

• Test 1: basic unit test added

Please describe the performance impact: none

Code Review Checklist (to be filled out by reviewer)

• NEW: Are there any Satellite database migrations? Are they forwards and backwards compatible?
• Does the PR describe what changes are being made?
• Does the PR describe why the changes are being made?
• Does the code follow our style guide?
• Does the code follow our testing guide?
• Is the PR appropriately sized? (If it could be broken into smaller PRs it should be)
• Does the new code have enough tests? (every PR should have tests or justification otherwise. Bug-fix PRs especially)
• Does the new code have enough documentation that answers "how do I use it?" and "what does it do?"? (both source documentation and higher level, diagrams?)
• Does any documentation need updating?
• Do the database access patterns make sense?

[TopperDEL]

Merge it! :)

[ifraixedes]

Out of curiosity, what while(0) does here?

[mniewrzal]

tbh don't know, maybe @bryanchriswhite will explain