Add `GET` `/api/v1/jobs`

[wslulciuc]

This PR adds the endpoint GET /api/v1/jobs, no longer requiring a namespace. You can still list jobs for a given namesake via GET /api/v1/namespaces/{namespace}/jobs

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[codecov[bot]]

Codecov Report

Attention: Patch coverage is 88.88889% with 1 line in your changes missing coverage. Please review.

Project coverage is 81.13%. Comparing base (90a2f65) to head (0042457). Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
api/src/main/java/marquez/api/JobResource.java	80.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2930 +/- ## ============================================ + Coverage 81.02% 81.13% +0.10% - Complexity 241 1507 +1266 ============================================ Files 43 268 +225 Lines 996 7367 +6371 Branches 40 330 +290 ============================================ + Hits 807 5977 +5170 - Misses 160 1229 +1069 - Partials 29 161 +132 ```

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