Add Capmonster support per PR from @DerLeole

[codders]

Implements feedback on PR #630 - many thanks to @DerLeole

[codecov]

Codecov Report

Attention: Patch coverage is 30.63063% with 77 lines in your changes missing coverage. Please review.

Project coverage is 63.81%. Comparing base (64e03eb) to head (ef81250).
Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
flathunter/abstract_crawler.py	6.38%	43 Missing and 1 partial ⚠️
flathunter/captcha/capmonster_solver.py	38.46%	24 Missing ⚠️
flathunter/captcha/captcha_solver.py	62.50%	3 Missing ⚠️
flathunter/crawler/immobilienscout.py	25.00%	3 Missing ⚠️
flathunter/config.py	77.77%	1 Missing and 1 partial ⚠️
flathunter/captcha/twocaptcha_solver.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #634      +/-   ##
==========================================
- Coverage   65.47%   63.81%   -1.66%     
==========================================
  Files          41       42       +1     
  Lines        2285     2393     +108     
  Branches      276      289      +13     
==========================================
+ Hits         1496     1527      +31     
- Misses        694      768      +74     
- Partials       95       98       +3     

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