Prompt registry Completions Endpoint and display gitlab prompts on UI

[deepanshululla]

Implements Prompt registry endpoints with gitlab + db

Relevant issues

#15169

Pre-Submission checklist

Please complete all items before asking a LiteLLM maintainer to review your PR

• I have Added testing in the tests/litellm/ directory, Adding at least 1 test is a hard requirement - see details
• I have added a screenshot of my new test passing locally
• My PR passes all unit tests on make test-unit
• My PR's scope is as isolated as possible, it only solves 1 specific problem

Type

🆕 New Feature

Changes

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