Add SPM support and remove Cocoapods

[adrianrl]

PR's key points

Add SPM support and remove Cocoapods. I've also removed fastlane because it's not needed here.
To open the project with Xcode just double click Package.swift or open the enclosing folder.
You can also open this folder with any editor like Zed, VS Code or Sublime Text and you will have all Swift LSP features!

How to review this PR?

Run tests using Xcode or with this command:

swift test

You can integrate this in a existing project using this feature branch

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.82%. Comparing base (bae2d09) to head (f1aa34b).

❗ There is a different number of reports uploaded between BASE (bae2d09) and HEAD (f1aa34b). Click for more details.

HEAD has 3 uploads less than BASE

Flag	BASE (bae2d09)	HEAD (f1aa34b)
ios	1	0
tv	1	0
mac	1	0

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #21      +/-   ##
==========================================
- Coverage   93.95%   87.82%   -6.14%     
==========================================
  Files          45       28      -17     
  Lines        2415     1010    -1405     
==========================================
- Hits         2269      887    -1382     
+ Misses        146      123      -23     

Flag	Coverage Δ
ios	?
mac	?
package	87.82% <ø> (?)
tv	?

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