🔥 remove ECC framework

[burgholzer]

Description

This is the pendant to cda-tum/mqt-qecc#256 and removes the ECC framework from MQT Core.
This mostly slims down the MQT Core library a little and eliminates hardly maintained code.

Checklist:

• The pull request only contains commits that are related to it.
• I have added appropriate tests and documentation.
• I have made sure that all CI jobs on GitHub pass.
• The pull request introduces no new warnings and follows the project's style guidelines.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.7%. Comparing base (5802520) to head (a47f234).
Report is 120 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff           @@
##            main    #667    +/-   ##
======================================
  Coverage   91.7%   91.7%            
======================================
  Files        148     133    -15     
  Lines      14832   14106   -726     
  Branches    2386    2212   -174     
======================================
- Hits       13603   12945   -658     
+ Misses      1229    1161    -68     

Flag	Coverage Δ
cpp	91.5% <ø> (+<0.1%)	⬆️
python	99.7% <ø> (ø)

see 4 files with indirect coverage changes