Support ignore patterns for requests library

[mvalkon]

In some cases the user might want to avoid tracing of specific URL's or endpoints. This commit adds a new parameter to the trace_requests()-function to set a list of URL patterns to ignore when a request is made. ignore_patterns is a keyword argument and should contain python regex patterns that can be used for matching. For example, ignore tracing requests to a sidecar container running in localhost:4040:

trace_requests(ignore_patterns=[r".*localhost:4040"])

[codecov[bot]]

Codecov Report

Merging #15 into master will increase coverage by 0.03%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #15      +/-   ##
==========================================
+ Coverage    97.9%   97.94%   +0.03%     
==========================================
  Files           7        7              
  Lines         239      243       +4     
==========================================
+ Hits          234      238       +4     
  Misses          5        5

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

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[mohabusama]

👍

[mvalkon]

👍