Add tarce_sqlalchemy for Sqlalchemy tracing support

[mohabusama]

• Fix None operation name for Flask not found urls
• Add support for Flask operation name customization via a callable
• Add timeout tag to all requests
• Add component tags to requests and flask
• Use proper tags for Flask according to semantic conventions

[codecov[bot]]

Codecov Report

Merging #19 into master will increase coverage by 0.25%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #19      +/-   ##
==========================================
+ Coverage      98%   98.26%   +0.25%     
==========================================
  Files           7        8       +1     
  Lines         251      288      +37     
==========================================
+ Hits          246      283      +37     
  Misses          5        5

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

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[vetinari]

:+1:

[mohabusama]

👍