gRPC endpoint to add collections to access-policies

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.05 :tada:

Comparison is base (6cbd8e7) 89.36% compared to head (02aaca3) 89.41%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #42 +/- ## ========================================== + Coverage 89.36% 89.41% +0.05% ========================================== Files 29 29 Lines 1439 1446 +7 Branches 108 108 ========================================== + Hits 1286 1293 +7 Misses 132 132 Partials 21 21 ``` | [Impacted Files](https://app.codecov.io/gh/uditha-atukorala/gatekeeper/pull/42?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Uditha+Atukorala) | Coverage Δ | | |---|---|---| | [src/service/gatekeeper.access-policies.cpp](https://app.codecov.io/gh/uditha-atukorala/gatekeeper/pull/42?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Uditha+Atukorala#diff-c3JjL3NlcnZpY2UvZ2F0ZWtlZXBlci5hY2Nlc3MtcG9saWNpZXMuY3Bw) | `88.00% <100.00%> (+1.95%)` | :arrow_up: |

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