Add Utkarsh as maintainer

[cijothomas]

Utkarsh has been playing a key role in advancing this project as an approver for last few months. He started with Metrics signal, but has since then expanded to cover entire repo.
His thorough reviews and guidance are well appreciated by contributors.

Proposing to make Utkarsh a maintainer for this project.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.4%. Comparing base (17f4627) to head (cfc24cf).
Report is 1 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #2226   +/-   ##
=====================================
  Coverage   79.4%   79.4%           
=====================================
  Files        121     121           
  Lines      20962   20962           
=====================================
+ Hits       16654   16656    +2     
+ Misses      4308    4306    -2     

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[utpilla]

Thank you! I look forward to helping maintain this repo.

[TommyCpp]

cc @jtescher @hdost

[lalitb]

cc @hdost

[cijothomas]

All criterion from https://github.com/open-telemetry/community/blob/main/guides/contributor/membership.md#becoming-a-maintainer is satisfied, merging.

The person being nominated has accepted the nomination by approving the pull request - Done
All maintainers have approved the pull request OR a majority of maintainers have approved the pull request and no maintainer has objected by requesting changes on the pull request. In the case that all maintainers have not given approval, the pull request should stay open for a minimum of 5 days before merging.

Nominated person has accepted, Majority maintainers approved, no objections from others, and 5 days has elapsed.

[cijothomas]

Welcome @utpilla to @open-telemetry/rust-maintainers !