Add Swift package registry

[KN4CK3R]

This PR adds a Swift package registry.

[lunny]

Just finished the code review without a test. Trusted Approval.

[wxiaoguang]

Could this code block be moved into a swfit-related go file to keep the api.go simple?

[KN4CK3R]

I would like to keep it here because it's not "swift logic" but "router logic". The docker part at the end of the file does something similar.

[codecov-commenter]

Codecov Report

Merging #22404 (6328f6d) into main (d74a7ef) will increase coverage by 47.18%.
The diff coverage is 71.39%.

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@@            Coverage Diff            @@
##           main   #22404       +/-   ##
=========================================
+ Coverage      0   47.18%   +47.18%     
=========================================
  Files         0     1151     +1151     
  Lines         0   151938   +151938     
=========================================
+ Hits          0    71697    +71697     
- Misses        0    71775    +71775     
- Partials      0     8466     +8466     

Impacted Files	Coverage Δ
models/packages/package.go	45.45% <0.00%> (ø)
services/forms/package_form.go	0.00% <ø> (ø)
modules/packages/swift/metadata.go	58.76% <58.76%> (ø)
routers/api/packages/swift/swift.go	72.86% <72.86%> (ø)
models/packages/descriptor.go	68.18% <100.00%> (ø)
modules/setting/packages.go	86.95% <100.00%> (ø)
routers/api/packages/api.go	90.51% <100.00%> (ø)
routers/api/v1/packages/package.go	88.82% <100.00%> (ø)
services/packages/packages.go	59.51% <100.00%> (ø)

... and 1142 files with indirect coverage changes

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[jolheiser]

🎺 🤖