Message referencing

[S-Eibl]

According to #21, this pull request should enable the processing of messages from the proto file

• The messages are stored in ds with their full name (especially regarding nested messages)
• The references are resolved by linking the injected DataSchema at the field's position that included the other message
• The program detects if the references include a circle and raise an error in that case
• The program recognizes if a reference cannot be resolved and raise an error in that case

There is an alternative implementation with a seperate data_schema_builder, I would be interested in your opinion on what is better

[codecov-commenter]

Codecov Report

Merging #26 (ea410d2) into main (5b12976) will increase coverage by 32.93%. The diff coverage is 84.12%.

@@             Coverage Diff             @@
##             main      #26       +/-   ##
===========================================
+ Coverage   15.18%   48.12%   +32.93%     
===========================================
  Files           1        1               
  Lines          79      133       +54     
===========================================
+ Hits           12       64       +52     
- Misses         67       69        +2     

Impacted Files	Coverage Δ
builder.go	48.12% <84.12%> (+32.93%)	:arrow_up:

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