add CLI package operation + support CWL package retrieval for provider process

[fmigneault]

Changes

• Add GET /providers/{provider_id}/processes/{process_id}/package endpoint that allows retrieval of the CWL
Application Package definition generated for the specific Provider's Process definition.
• Add CLI package operation to request the remote Provider or local Process CWL Application Package.
• Add CLI output reporting of performed HTTP requests details when using the --debug/-d option.
• Modify default behavior of visibility field (under processDescription or processDescription.process)
  to employ the expected functionality by native OGC API - Processes clients that do not support this option
  (i.e.: public by default), and to align resolution strategy with deployments by direct CWL payload which do not
  include this feature either. A Process deployment that desires to employ this feature (visibility: private) will
  have to provide the value explicitly, or update the deployed Process definition afterwards with the relevant
  PUT request. Since public will now be used by default, the CLI will not automatically inject the value
  in the payload anymore when omitted.

Fixes

• Fix links listing duplicated in response from Process deployment.
  Links will only be listed within the returned processSummary to respect the OGC API - Processes schema.
• Fix CLI not removing embedded links in processSummary from deploy operation response
  when -nL/--no-links option is specified.

[codecov]

Codecov Report

Merging #562 (d1f961a) into master (34debdc) will increase coverage by 0.01%.
The diff coverage is 92.85%.

@@            Coverage Diff             @@
##           master     #562      +/-   ##
==========================================
+ Coverage   84.46%   84.47%   +0.01%     
==========================================
  Files          79       79              
  Lines       17704    17732      +28     
  Branches     2685     2688       +3     
==========================================
+ Hits        14953    14979      +26     
- Misses       2022     2024       +2     
  Partials      729      729              

Files Changed	Coverage Δ
weaver/wps_restapi/providers/providers.py	84.72% <80.00%> (-0.79%)	⬇️
weaver/cli.py	85.83% <95.45%> (+0.23%)	⬆️
weaver/datatype.py	78.81% <100.00%> (ø)
weaver/processes/utils.py	79.85% <100.00%> (+0.07%)	⬆️
weaver/wps_restapi/providers/__init__.py	100.00% <100.00%> (ø)
weaver/wps_restapi/swagger_definitions.py	99.82% <100.00%> (+<0.01%)	⬆️