Add has_many_to_many interface

[zussel]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 79.26136% with 146 lines in your changes missing coverage. Please review.

Project coverage is 85.69%. Comparing base (58fcb59) to head (13d4451).

Files	Patch %	Lines
src/db/mssql/mssql_dialect.cpp	0.00%	15 Missing ⚠️
src/object/object_json_attribute_extractor.cpp	0.00%	15 Missing ⚠️
include/matador/object/node_analyzer.tpp	88.88%	14 Missing ⚠️
include/matador/object/prototype_info.hpp	58.62%	12 Missing ⚠️
src/sql/field.cpp	40.00%	12 Missing ⚠️
include/matador/orm/relation_resolver.hpp	73.33%	8 Missing ⚠️
include/matador/object/object_deserializer.hpp	69.56%	7 Missing ⚠️
include/matador/object/object_serializer.hpp	46.15%	7 Missing ⚠️
src/utils/foreign_attributes.cpp	36.36%	7 Missing ⚠️
...atador/object/relation_endpoint_value_inserter.hpp	50.00%	6 Missing ⚠️
... and 16 more

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #165      +/-   ##
===========================================
- Coverage    85.86%   85.69%   -0.17%     
===========================================
  Files          342      347       +5     
  Lines        14456    14775     +319     
===========================================
+ Hits         12412    12661     +249     
- Misses        2044     2114      +70     

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