chore(user-manager): add generic constraints and decouple from protocols

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 11 lines in your changes missing coverage. Please review.

Project coverage is 27.16%. Comparing base (b3393ef) to head (dd0783a). Report is 5 commits behind head on dev.

Files	Patch %	Lines
.../src/services/user-manager/user-manager.service.ts	0.00%	7 Missing :warning:
...re/src/services/authz-io/authz-io-local.service.ts	0.00%	2 Missing :warning:
...heets-ui/src/views/permission/panel-list/index.tsx	0.00%	1 Missing :warning:
...omment-ui/src/views/thread-comment-panel/index.tsx	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #2513 +/- ## ========================================== + Coverage 27.12% 27.16% +0.03% ========================================== Files 1653 1653 Lines 83328 83358 +30 Branches 17260 17263 +3 ========================================== + Hits 22605 22642 +37 + Misses 60723 60716 -7 ```

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