feat: Add support for backing up repositories owned by the current user

[notheotherben]

This PR adds support for backing up repos owned by the current user, without needing to specify the current user's username. This solves the issue of being unable to backup private personal repos (given the way the GitHub API works when requesting /users/${username}/repos regardless of whether your username matches ${username}.

In addition to this, I've included support for a new properties.query field which can be used to pass query parameters to the GitHub API, allowing you to select which repos get included in a query (for example, you can filter repos for the current user to only include owner, or include any combination of the default owner,collaborator,organization_member.

Oh, and I should mention that we now handle cases where you don't specify an OTEL_EXPORTER_OTLP_ENDPOINT without reporting an error - and correctly fall back to logging to the terminal.

[codecov]

Codecov Report

Attention: Patch coverage is 76.19048% with 10 lines in your changes missing coverage. Please review.

Project coverage is 70.62%. Comparing base (928aa44) to head (ee617ea).

Files with missing lines	Patch %	Lines
src/sources/github_repo.rs	81.48%	5 Missing ⚠️
src/main.rs	0.00%	3 Missing ⚠️
src/telemetry/mod.rs	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #116      +/-   ##
==========================================
- Coverage   70.65%   70.62%   -0.04%     
==========================================
  Files          24       24              
  Lines        2164     2175      +11     
==========================================
+ Hits         1529     1536       +7     
- Misses        635      639       +4     

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