Support skipping a trace in the trace decorator

[mvalkon]

Adds functionality for the @trace-decorator to accept a callable skip_trace. This callable should return a bool depending on whether to skip a trace based on some parameters in either *args or **kwargs. For example, when using the trace_requests=(ignore_url_pattern[..]), a matcher function is used to validate the request.url against any patterns in the list.

Resolves #16

[codecov[bot]]

Codecov Report

Merging #17 into master will increase coverage by 0.06%. The diff coverage is 100%.

@@           Coverage Diff           @@
##           master   #17      +/-   ##
=======================================
+ Coverage   97.94%   98%   +0.06%     
=======================================
  Files           7     7              
  Lines         243   251       +8     
=======================================
+ Hits          238   246       +8     
  Misses          5     5

Impacted Files	Coverage Δ
opentracing_utils/decorators.py	100% <100%> (ø)	:arrow_up:
opentracing_utils/libs/_requests.py	100% <100%> (ø)	:arrow_up:

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[mohabusama]

Thanks @mvalkon !

[mohabusama]

👍

[mvalkon]

👍