Add Request properties for HTTP method info

[ahopkins]

Adds three properties to Request object:

• is_safe
• is_idempotent
• is_cacheable

[codecov]

Codecov Report

Merging #2516 (e36a51e) into main (8e9342e) will increase coverage by 0.027%.
The diff coverage is 100.000%.

@@              Coverage Diff              @@
##              main     #2516       +/-   ##
=============================================
+ Coverage   87.403%   87.430%   +0.027%     
=============================================
  Files           69        69               
  Lines         5565      5577       +12     
  Branches       969       969               
=============================================
+ Hits          4864      4876       +12     
  Misses         509       509               
  Partials       192       192               

Impacted Files	Coverage Δ
sanic/constants.py	100.000% <100.000%> (ø)
sanic/request.py	95.396% <100.000%> (+0.108%)	⬆️

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