Separate API and add deprications

[zambrovski]

• adds a lot of deprecation to the old API, to be able to change stuff in the future
• changes module structure (exposes camunda-bpm-data-api, camunda-bpm-data-c7)

[codecov]

Codecov Report

Attention: 273 lines in your changes are missing coverage. Please review.

Comparison is base (e9144bd) 77.74% compared to head (69bbeb3) 70.46%.
Report is 4 commits behind head on develop.

Files	Patch %	Lines
...unda/camunda/bpm/data/factory/C7VariableFactory.kt	0.00%	65 Missing ⚠️
...in/io/holunda/camunda/bpm/data/reader/MapReader.kt	0.00%	34 Missing ⚠️
...camunda/bpm/data/writer/ScopedVariableMapWriter.kt	0.00%	25 Missing ⚠️
...lunda/camunda/bpm/data/writer/VariableMapWriter.kt	38.46%	21 Missing and 3 partials ⚠️
...munda/bpm/data/reader/CaseServiceVariableReader.kt	47.05%	5 Missing and 4 partials ⚠️
...da/bpm/data/reader/RuntimeServiceVariableReader.kt	47.05%	5 Missing and 4 partials ⚠️
...munda/bpm/data/reader/TaskServiceVariableReader.kt	47.05%	5 Missing and 4 partials ⚠️
...munda/bpm/data/writer/CaseServiceVariableWriter.kt	52.63%	5 Missing and 4 partials ⚠️
...da/bpm/data/writer/RuntimeServiceVariableWriter.kt	52.63%	5 Missing and 4 partials ⚠️
...munda/bpm/data/writer/TaskServiceVariableWriter.kt	52.63%	5 Missing and 4 partials ⚠️
... and 14 more

Additional details and impacted files

@@              Coverage Diff              @@
##             develop     #406      +/-   ##
=============================================
- Coverage      77.74%   70.46%   -7.28%     
- Complexity       497      515      +18     
=============================================
  Files             76       80       +4     
  Lines           1339     1605     +266     
  Branches          83      148      +65     
=============================================
+ Hits            1041     1131      +90     
- Misses           245      406     +161     
- Partials          53       68      +15     

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