move ows proxy send_request function under corresponding adapter method

[fmigneault]

Changes:

• Add /ows/verify/{service_name}[/{extra_path}] endpoint analoguous to /ows/proxy/{service_name}[/{extra_path}]
  to only verify if access is granted to this service, for that specific resource path, and for the authenticated user,
  without performing the proxied request. This can be employed by servers and external entities to validate that
  authorization will be granted for the user without executing potentially heavy computation or large data transfers
  from the targeted resource that would otherwise be performed by requesting the /ows/proxy equivalent location.
  One usage example of this feature is using NGINX Authentication Based on Subrequest Result to verify an alternate resource prior to proxying a service
  request that needs authenticated access to the first resource.
• Add the OWS proxy send_request operation under the twitcher.adapter interface to allow it applying relevant
  proxying adjustments when using derived implementation. The DefaultAdapater simply calls the original function
  that was previously called directly instead of using the adapter's method.
• Removed the extra_path and request_params arguments from OWS proxy send_request to better align them with
  arguments from other adapter methods. These parameters are directly retrieved from the request argument, which was
  also provided as input to send_request.

Purpose

This is used in conjunction of Ouranosinc/Magpie#571
Without this fix, there is no way for Magpie to retrieve the link between the proxied request/response, as this was all contained within send_request.

To Do

Twitcher 0.8.0 will be tagged (and should be released) after merge in order to build the new Docker required by Magpie.

[codecov-commenter]

Codecov Report

Merging #118 (80dc1c2) into master (8c2bf25) will decrease coverage by 0.41%.
The diff coverage is 50.00%.

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@@            Coverage Diff             @@
##           master     #118      +/-   ##
==========================================
- Coverage   74.20%   73.80%   -0.41%     
==========================================
  Files          41       41              
  Lines        1795     1821      +26     
==========================================
+ Hits         1332     1344      +12     
- Misses        463      477      +14     

Impacted Files	Coverage Δ
twitcher/owsproxy.py	61.31% <45.00%> (-3.15%)	⬇️
twitcher/adapter/base.py	53.33% <50.00%> (-0.24%)	⬇️
twitcher/utils.py	81.35% <50.00%> (ø)
twitcher/adapter/default.py	75.67% <62.50%> (-3.64%)	⬇️

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