Add StorageContentGet function

[alperencelik]

This PR tries to add a function to get all existing content from node's specified storage.

The following API documentation:

https://pve.proxmox.com/pve-docs/api-viewer/#/nodes/{node}/storage/{storage}/content

[codecov]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (fdb95a1) 25.95% compared to head (ea6e142) 25.86%.
Report is 2 commits behind head on main.

Files	Patch %	Lines
nodes.go	0.00%	3 Missing ⚠️
storage.go	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #111      +/-   ##
==========================================
- Coverage   25.95%   25.86%   -0.09%     
==========================================
  Files          15       15              
  Lines        1753     1759       +6     
==========================================
  Hits          455      455              
- Misses       1278     1284       +6     
  Partials       20       20              

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[alperencelik]

IMO, there is still an option to get content by type but in my use case I would like to get all contents and filter by filename so I thought adding this function might be a proper implementation. I hope I didn't miss anything.

[luthermonson]

Would this be better as a receiver on Storage and in this file?

[alperencelik]

Would this be better as a receiver on Storage and in this file?

That makes more sense to me as well so updated accordingly.

[luthermonson]

thanks for the pr! i cut a beta3 in case you need this and want to pin to something