✨ add parser for .real files

[burgholzer]

Description

This moves the .real parser from MQT Core, where it has been removed in cda-tum/mqt-core#822, to this repository.
As there are no previous connection points to the SyReC repository, this is relatively standalone for now.

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

Attention: Patch coverage is 68.90380% with 139 lines in your changes missing coverage. Please review.

Project coverage is 83.1%. Comparing base (947c16a) to head (4137575).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
src/core/real/parser.cpp	68.7%	94 Missing and 45 partials ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #219     +/-   ##
=======================================
- Coverage   85.4%   83.1%   -2.4%     
=======================================
  Files         33      35      +2     
  Lines       2753    3200    +447     
  Branches     497     577     +80     
=======================================
+ Hits        2352    2660    +308     
- Misses       196     290     +94     
- Partials     205     250     +45     

Flag	Coverage Δ
cpp	83.1% <68.9%> (-2.4%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.