fix(logging): Make underlying transport visible in LoggingCoapTransport

[akolosov-n]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 92.99%. Comparing base (cec0ecd) to head (db02623).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
.../com/mbed/coap/transport/LoggingCoapTransport.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #100      +/-   ##
============================================
- Coverage     93.01%   92.99%   -0.03%     
  Complexity     2033     2033              
============================================
  Files           134      134              
  Lines          4598     4599       +1     
  Branches        617      617              
============================================
  Hits           4277     4277              
- Misses          177      178       +1     
  Partials        144      144              

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