[mdatagen] move telemetry into its own file

[codeboten]

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This is in preparation for using mdatagen for component telemetry.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 93.54839% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 91.87%. Comparing base (326ef7c) to head (4c38412). Report is 3 commits behind head on main.

Files	Patch %	Lines
cmd/mdatagen/main.go	33.33%	2 Missing and 2 partials :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10037      +/-   ##
==========================================
+ Coverage   91.55%   91.87%   +0.31%     
==========================================
  Files         360      360              
  Lines       16693    16725      +32     
==========================================
+ Hits        15284    15366      +82     
+ Misses       1073     1021      -52     
- Partials      336      338       +2     

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