Use LiteralOrIri instead of std::string in LocalVocab

[joka921]

Continue work started with #1186 (which introduced the class LiteralOrIri) and #1318 (which used LiteralOrIri instead of std::string in all SPARQL expressions). This change now uses LiteralOrIri instead of std::string whenever dealing with words from a LocalVocab.

[codecov]

Codecov Report

Attention: Patch coverage is 92.30769% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 88.81%. Comparing base (07a42ef) to head (13a7542).

Files	Patch %	Lines
src/engine/ExportQueryExecutionTrees.cpp	94.11%	1 Missing ⚠️
src/engine/GroupByHashMapOptimization.h	83.33%	1 Missing ⚠️
...sparqlExpressions/SparqlExpressionValueGetters.cpp	66.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1333      +/-   ##
==========================================
- Coverage   88.84%   88.81%   -0.03%     
==========================================
  Files         322      322              
  Lines       28512    28515       +3     
  Branches     3144     3143       -1     
==========================================
- Hits        25331    25327       -4     
- Misses       2041     2046       +5     
- Partials     1140     1142       +2     

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[hannahbast]

1-1 with Johannes, thanks a lot + some minor changes

[sonarqubecloud]

Quality Gate passed

Issues
3 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud