Feature/type consolidation

[acelaya]

Closes #74

Closes #22

Part of #72

This PR renames and consolidates many API contract types, to make it more consistent, and adhere to the changes from Shlink 4.0.0.

It also drops supports for Shlink older than v3.3.0, removing the need to take the API v2 into consideration.

[codecov]

Codecov Report

Attention: Patch coverage is 65.33333% with 26 lines in your changes are missing coverage. Please review.

Project coverage is 77.07%. Comparing base (a1bf79e) to head (2f19dd3).
Report is 8 commits behind head on main.

Files	Patch %	Lines
src/api/ShlinkApiClient.ts	64.86%	0 Missing and 26 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #75      +/-   ##
==========================================
- Coverage   85.71%   77.07%   -8.65%     
==========================================
  Files          13        9       -4     
  Lines         763      410     -353     
  Branches      103       92      -11     
==========================================
- Hits          654      316     -338     
+ Misses          7        3       -4     
+ Partials      102       91      -11     

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