user_events exporters: Prepare for v0.4.0 release

[lalitb]

Changes

• user_events Metrics and Logs exporter.
• update the version to v0.4.0 for user_events logs and metrics exporters.
• Updated changelog.

Please provide a brief description of the changes here.

Merge requirement checklist

• [ ] CONTRIBUTING guidelines followed
• [ ] Unit tests added/updated (if applicable)
• [ ] Appropriate CHANGELOG.md files updated for non-trivial, user-facing changes
• [ ] Changes in public API reviewed (if applicable)

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 50.7%. Comparing base (56a6f45) to head (1472431). Report is 4 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #70 +/- ## ======================================= - Coverage 52.3% 50.7% -1.6% ======================================= Files 38 20 -18 Lines 4967 1937 -3030 ======================================= - Hits 2598 983 -1615 + Misses 2369 954 -1415 ```

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