feat: Support for YAML files in references via HTTP & HTTP schemas

[Stranger6667]

Closes #600

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities (and 0 Security Hotspots to review)
0 Code Smells

No Coverage information
0.0% Duplication

[codecov-commenter]

Codecov Report

Merging #601 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #601   +/-   ##
=======================================
  Coverage   99.73%   99.73%           
=======================================
  Files          41       41           
  Lines        2673     2677    +4     
  Branches      432      432           
=======================================
+ Hits         2666     2670    +4     
  Misses          3        3           
  Partials        4        4           

Flag	Coverage Δ
#unittests	99.73% <100.00%> (+<0.01%)	⬆️

Impacted Files	Coverage Δ
src/schemathesis/specs/openapi/references.py	100.00% <100.00%> (ø)

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