refactor: move data.hcloud_server_type(s) to Plugin Framework

[jooola]

Related to #752

[jooola]

We are probably blocked by https://togithub.com/hashicorp/terraform-plugin-framework/issues/510

[codecov]

Codecov Report

Attention: Patch coverage is 86.28571% with 24 lines in your changes missing coverage. Please review.

Project coverage is 69.62%. Comparing base (d73828a) to head (1839ed7).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/servertype/data_source.go	86.12%	17 Missing and 7 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #959      +/-   ##
==========================================
- Coverage   69.65%   69.62%   -0.03%     
==========================================
  Files          64       64              
  Lines        7974     8010      +36     
==========================================
+ Hits         5554     5577      +23     
- Misses       1719     1730      +11     
- Partials      701      703       +2     

Flag	Coverage Δ
e2e	69.62% <86.28%> (-0.03%)	⬇️
unit	34.14% <41.71%> (-0.11%)	⬇️

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[jooola]

For the plugin framework upgrade test to work, we must release a patch version with #984.

[apricote]

This looks great besides the cx11 issue and the one question I had.