Add resources_lock_ lock_guards to avoid race condition when loading robot_description through topic (backport #1451)

[mergify]

As reported in #1442, loading the robot_description through the topic will cause a segmentation fault or some undefined behaviors as the read and write methods real-time methods are continuously executed, and when the robot description is received and the resource_manager is to be initialized, there is no lock_guard of recursive mutex resources_lock_, which should avoid the RM to execute the components when they are changing state or being loaded and initialized

Fixes #1442

---

This is an automatic backport of pull request #1451 done by Mergify.

[mergify]

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	both modified:   hardware_interface/src/resource_manager.cpp

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 62.22%. Comparing base (369ba8a) to head (eeb4f73).
Report is 1 commits behind head on iron.

Additional details and impacted files

@@           Coverage Diff           @@
##             iron    #1600   +/-   ##
=======================================
  Coverage   62.22%   62.22%           
=======================================
  Files         112      112           
  Lines       12296    12298    +2     
  Branches     8602     8604    +2     
=======================================
+ Hits         7651     7653    +2     
+ Misses        878      877    -1     
- Partials     3767     3768    +1     

Flag	Coverage Δ
unittests	62.22% <100.00%> (+<0.01%)	⬆️

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

Files with missing lines	Coverage Δ
hardware_interface/src/resource_manager.cpp	76.92% <100.00%> (+0.07%)	⬆️

... and 1 file with indirect coverage changes

[saikishor]

LGTM