feat(edge_services): add serverless function backend

[scaleway-bot]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 20 lines in your changes missing coverage. Please review.
✅ Project coverage is 57.06%. Comparing base (c796412) to head (fa49f99).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...espaces/edge_services/v1beta1/edge_services_cli.go	0.00%	20 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5246      +/-   ##
==========================================
- Coverage   57.08%   57.06%   -0.02%     
==========================================
  Files         313      313              
  Lines       70056    70076      +20     
==========================================
  Hits        39990    39990              
- Misses      28573    28593      +20     
  Partials     1493     1493              

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