Better parsing for the words- and docsfile

[Flixtastic]

Seperate PR to further improve the parsing during the textindex building.

[Flixtastic]

One question I have is that I didn't find a solution to convert absl::StrSplit to a std::range or std::view and therefore resulted to using another cppcoro generator. I've seen the idea to avoid these generators but am I right that it is only possible to use these new Iterators through creating classes that implement them?

[sparql-conformance]

Conformance check passed ✅

No test result changes.

Details: https://qlever.cs.uni-freiburg.de/sparql-conformance-ui?cur=9c40084f65a30eebeb4c5669dab1f28547c3028f&prev=97c195aaf9e249f43a6417f99ea93f7e94831f39

[codecov]

Codecov Report

Attention: Patch coverage is 77.96610% with 13 lines in your changes missing coverage. Please review.

Project coverage is 89.83%. Comparing base (97c195a) to head (9c40084).

Files with missing lines	Patch %	Lines
src/parser/WordsAndDocsFileParser.cpp	65.71%	12 Missing ⚠️
src/index/IndexImpl.Text.cpp	95.83%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1695      +/-   ##
==========================================
- Coverage   89.84%   89.83%   -0.01%     
==========================================
  Files         389      389              
  Lines       37268    37284      +16     
  Branches     4202     4204       +2     
==========================================
+ Hits        33482    33494      +12     
- Misses       2485     2490       +5     
+ Partials     1301     1300       -1     

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[sonarqubecloud]

Quality Gate passed

Issues
9 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud