Add logging for SenderException in RemoteReporter

[esukram]

Which problem is this PR solving?

Closes #653

Short description of the changes

In order to get more context if a SenderException has been thrown, the complete exception is logged with error level.

[codecov]

Codecov Report

Merging #662 into master will decrease coverage by 0.04%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master     #662      +/-   ##
============================================
- Coverage     89.64%   89.59%   -0.05%     
+ Complexity      569      567       -2     
============================================
  Files            69       69              
  Lines          2085     2086       +1     
  Branches        266      266              
============================================
  Hits           1869     1869              
- Misses          134      135       +1     
  Partials         82       82

Impacted Files	Coverage Δ	Complexity Δ
...egertracing/internal/reporters/RemoteReporter.java	87.35% <100%> (+4.79%)	7 <0> (ø)	⬇️
...rtracing/internal/reporters/CompositeReporter.java	71.42% <0%> (-28.58%)	6% <0%> (-1%)
...gertracing/internal/reporters/LoggingReporter.java	81.81% <0%> (-9.1%)	4% <0%> (-1%)

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[jpkrohling]

Thanks for your contribution!