Switch request handling to thread locals

[yakky]

Description

Use thread locals to store request to build absolute url

This is safer in general, and especially in ASGI environment. If ASGI (which ships its own version) is not available, we use threading local

Move to pytest runner to run async tests (though not on ASGI)

References

Fix #115

Checklist

• [x] I have read the contribution guide
• [x] Code lint checked via inv lint
• [x] changes file included (see docs)
• [x] Usage documentation added in case of new features
• [x] Tests added

[coveralls]

Coverage increased (+0.03%) to 98.592% when pulling f133b689d958837e07ac3334edb663198a9a0b1d on bugfix/issue-115-request-thread-locals into 1c3cffde9c813f29c522beb2a77571d53147e44e on develop.

[codecov[bot]]

Codecov Report

Merging #125 (f133b68) into develop (1c3cffd) will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##           develop      #125   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            4         5    +1     
  Lines          148       160   +12     
  Branches        15        15           
=========================================
+ Hits           148       160   +12     

Flag	Coverage Δ
unittests	99.37% <100.00%> (+0.05%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
meta/utils.py	100.00% <100.00%> (ø)

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