change opentracing to opentelemetry for tracing

[agungdwiprasetyo]

for existing service, only change jaeger host from 5775 (udp) to 4317 (latest jaeger version, using grpc exporter) without changing the code

test result:

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 103 lines in your changes missing coverage. Please review.

Project coverage is 17.21%. Comparing base (2f24be2) to head (53aedc1).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
tracer/jaeger.go	0.00%	63 Missing ⚠️
tracer/utils.go	0.00%	40 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #56      +/-   ##
==========================================
- Coverage   17.24%   17.21%   -0.03%     
==========================================
  Files          54       54              
  Lines        4176     4183       +7     
==========================================
  Hits          720      720              
- Misses       3431     3438       +7     
  Partials       25       25              

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