chore: implement v1 for conversions.py

[smereu]

Description

implement v1 for conversions.py.
Left out PartExportFormat which has been removed from the API server (but should be added back)

Issue linked

Please mention the issue number or describe the problem this pull request addresses.

Checklist

• I have tested my changes locally.
• I have added necessary documentation or updated existing documentation.
• I have followed the coding style guidelines of this project.
• I have added appropriate unit tests.
• I have reviewed my changes before submitting this pull request.
• I have linked the issue or issues that are solved to the PR if any.
• I have assigned this PR to myself.
• I have added the minimum version decorator to any new backend method implemented.
• I have made sure that the title of my PR follows Conventional commits style (e.g. feat: extrude circle to cylinder)

[codecov]

Codecov Report

❌ Patch coverage is 16.87898% with 261 lines in your changes missing coverage. Please review.
✅ Project coverage is 92.97%. Comparing base (2f6eb70) to head (af03b08).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...ys/geometry/core/_grpc/_services/v1/conversions.py	16.87%	261 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2403      +/-   ##
==========================================
- Coverage   95.08%   92.97%   -2.11%     
==========================================
  Files         169      169              
  Lines       11343    11656     +313     
==========================================
+ Hits        10785    10837      +52     
- Misses        558      819     +261     

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[jacobrkerstetter]

LGTM - let's get this in so we can start testing it with other methods. I will do a big cleanup/reorg at the end of v1 😃