feat: add twisted integration

[Kyle-Verhoog]

Integration

This PR adds support for twisted. This includes patches for trace context propagation as well as support for the http client.

Links

• Integration docs: https://twistedmatrix.com/trac/
• Corp docs PR:

Checklist

• [x] Documentation added in __init__.py.
• [ ] Corp docs are updated.
• [ ] Entry added to CHANGELOG.md.

Testing

• [x] Tests are added to CI.
• [x] Functionality is maintained from original library.
• [x] All Python versions that the library supports are tested.
• [x] All relevant library versions (including the latest) are tested.
• [ ] Global configuration
  • [ ] Inherits DD_SERVICE (if applicable)
  • [ ] Environment variables are provided for config options.
  • [ ] ddtrace.config.
• [ ] Instance configuration
  • [ ] Pin overriding.
  • [ ] Service name override (if applicable)
• [x] Async (if applicable)
  • [x] Span parenting behaves as expected.

[codecov-io]

Codecov Report

Merging #1669 (655188f) into master (415c5cc) will decrease coverage by 0.78%. The diff coverage is 7.17%.

@@            Coverage Diff             @@
##           master    #1669      +/-   ##
==========================================
- Coverage   83.31%   82.52%   -0.79%     
==========================================
  Files         548      552       +4     
  Lines       37809    38213     +404     
==========================================
+ Hits        31499    31537      +38     
- Misses       6310     6676     +366     

Impacted Files	Coverage Δ
ddtrace/contrib/twisted/patch.py	0.00% <0.00%> (ø)
ddtrace/monkey.py	89.33% <ø> (ø)
tests/contrib/twisted/test_twisted.py	0.00% <0.00%> (ø)
tests/contrib/twisted/test_twisted_patch.py	0.00% <0.00%> (ø)
ddtrace/contrib/twisted/__init__.py	66.66% <66.66%> (ø)
ddtrace/context.py	98.33% <100.00%> (+0.23%)	:arrow_up:
tests/tracer/test_context.py	100.00% <100.00%> (ø)
ddtrace/contrib/pymongo/parse.py	90.29% <0.00%> (-0.98%)	:arrow_down:
tests/profiling/exporter/test_http.py	92.90% <0.00%> (-0.68%)	:arrow_down:
tests/profiling/test_profiler.py	90.60% <0.00%> (-0.68%)	:arrow_down:
... and 10 more

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[mergify[bot]]

@Kyle-Verhoog this pull request is now in conflict 😩

[mergify[bot]]

@Kyle-Verhoog this pull request is now in conflict 😩