Export information of supported interfaces from transmissions

[saikishor]

This adds new methods that could expose the information of the interfaces and offsets outside, to be easily used with the hardware interface

[codecov]

Codecov Report

❌ Patch coverage is 75.00000% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.44%. Comparing base (1c445c7) to head (8f476ae).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...ce/include/transmission_interface/transmission.hpp	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3049      +/-   ##
==========================================
+ Coverage   89.40%   89.44%   +0.03%     
==========================================
  Files         157      157              
  Lines       18787    18666     -121     
  Branches     1510     1501       -9     
==========================================
- Hits        16797    16695     -102     
+ Misses       1369     1354      -15     
+ Partials      621      617       -4     

Flag	Coverage Δ
unittests	89.44% <75.00%> (+0.03%)	⬆️

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

Files with missing lines	Coverage Δ
...ansmission_interface/differential_transmission.hpp	76.34% <100.00%> (+0.39%)	⬆️
...ission_interface/four_bar_linkage_transmission.hpp	79.80% <100.00%> (+0.80%)	⬆️
...ude/transmission_interface/simple_transmission.hpp	77.63% <100.00%> (+1.24%)	⬆️
..._interface/test/differential_transmission_test.cpp	99.60% <100.00%> (+<0.01%)	⬆️
...erface/test/four_bar_linkage_transmission_test.cpp	99.39% <100.00%> (+<0.01%)	⬆️
...ission_interface/test/simple_transmission_test.cpp	100.00% <100.00%> (ø)
...ce/include/transmission_interface/transmission.hpp	14.28% <0.00%> (-85.72%)	⬇️

... and 8 files with indirect coverage changes

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