[Transmissions] Make transmission interface work with new variants approach

[saikishor]

The new changes to the handles, that the data exists inside the Handle itself will create problems with the old transmission_interface API and it is kinda dysfunctional with the new approach. This PR aims to solve the issue by migrating the transmission part to the new API and making it functional with the latest shared pointers approach.

[codecov]

Codecov Report

Attention: Patch coverage is 96.26168% with 16 lines in your changes missing coverage. Please review.

Project coverage is 89.46%. Comparing base (bfbedd2) to head (2d6e735).

Files with missing lines	Patch %	Lines
...ce/include/transmission_interface/transmission.hpp	0.00%	9 Missing ⚠️
...ude/transmission_interface/simple_transmission.hpp	76.92%	1 Missing and 2 partials ⚠️
...ansmission_interface/differential_transmission.hpp	95.23%	0 Missing and 2 partials ⚠️
...ission_interface/four_bar_linkage_transmission.hpp	93.54%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1845      +/-   ##
==========================================
- Coverage   89.59%   89.46%   -0.14%     
==========================================
  Files         139      139              
  Lines       15222    15408     +186     
  Branches     1290     1298       +8     
==========================================
+ Hits        13638    13784     +146     
- Misses       1096     1132      +36     
- Partials      488      492       +4     

Flag	Coverage Δ
unittests	89.46% <96.26%> (-0.14%)	⬇️

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

Files with missing lines	Coverage Δ
...erface/include/transmission_interface/accessor.hpp	83.33% <ø> (ø)
..._interface/test/differential_transmission_test.cpp	99.53% <100.00%> (+0.15%)	⬆️
...erface/test/four_bar_linkage_transmission_test.cpp	99.52% <100.00%> (+0.13%)	⬆️
...ission_interface/test/simple_transmission_test.cpp	100.00% <100.00%> (ø)
transmission_interface/test/utils_test.cpp	100.00% <100.00%> (ø)
...ansmission_interface/differential_transmission.hpp	74.04% <95.23%> (-5.77%)	⬇️
...ission_interface/four_bar_linkage_transmission.hpp	71.18% <93.54%> (-6.71%)	⬇️
...ude/transmission_interface/simple_transmission.hpp	70.17% <76.92%> (-4.34%)	⬇️
...ce/include/transmission_interface/transmission.hpp	9.09% <0.00%> (-90.91%)	⬇️

... and 2 files with indirect coverage changes

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