docs(node/client): documentation and interface implementation checks

[cloud-j-luna]

This PR adds documentation to the node client.
It also makes interface implementation checks on all clients.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 3.51%. Comparing base (14b1f7d) to head (18d5378).
Report is 4 commits behind head on main.

❗ Current head 18d5378 differs from pull request most recent head 8d81719. Consider uploading reports for the commit 8d81719 to get more accurate results

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #139   +/-   ##
=====================================
  Coverage   3.51%   3.51%           
=====================================
  Files        296     296           
  Lines      97291   97291           
=====================================
+ Hits        3415    3418    +3     
+ Misses     93697   93694    -3     
  Partials     179     179           

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