Prepare GenericSystem for other interface data types

[christophfroehlich]

I rewrote the GenericSystem to let the resource_manager handle the value storage. This enables now the support of other data_types than double.

Open question:

• in which transition should the initial values be set? (now in on_activate). Earlier this was done only once in on_init, which means that it remained after lifecycle change of the component.

Other minimal behavior changes:

• applies position_state_following_offset already to initial_values
• applies mimic.offset only to position interface

The current version iterates over the member variables of the HardwareComponentInterface instead of preallocating the values beforehand. I benchmarked the execution time with a config of 230 interfaces, and it increased from 2us to only 5us. I think this is negligible.

[codecov]

Codecov Report

❌ Patch coverage is 86.70520% with 23 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.36%. Comparing base (56fc052) to head (eda82f4).

Files with missing lines	Patch %	Lines
...e_interface/src/mock_components/generic_system.cpp	85.71%	14 Missing and 9 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2571      +/-   ##
==========================================
+ Coverage   89.31%   89.36%   +0.05%     
==========================================
  Files         145      145              
  Lines       16541    16572      +31     
  Branches     1396     1384      -12     
==========================================
+ Hits        14773    14809      +36     
+ Misses       1231     1224       -7     
- Partials      537      539       +2     

Flag	Coverage Δ
unittests	89.36% <86.70%> (+0.05%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...terface/include/mock_components/generic_system.hpp	100.00% <ø> (ø)
...rface/test/mock_components/test_generic_system.cpp	99.73% <100.00%> (+<0.01%)	⬆️
...e_interface/src/mock_components/generic_system.cpp	85.46% <85.71%> (+1.37%)	⬆️

... and 4 files with indirect coverage changes

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