Deploy OGC-API process using CWL payload

[fmigneault]

This PR provides important support of CWL directly specified as request content during process deployment (instead of nested under executionUnit), aligning with OGC Best Practices document.

• Support Change request for the OGC Application Package conformance class opengeospatial/ogcapi-processes#176
• Support Change request for the OGC Application Package CWL conformance class opengeospatial/ogcapi-processes#258

Changes

• Add support of official CWL IANA types to allow Process deployment with the relevant Content-Type header
  for the submitted payload.
• Support Process deployment using only CWL content provided it contains an id field representing the target
  Process ID as per recommendation in OGC Best Practice for Earth Observation Application Package, CWL Document <https://docs.ogc.org/bp/20-089r1.html#toc26>.
• Support Process deployment with a payload using YAML content instead of JSON. This YAML content
  MUST be submitted in the request with a Content-Type header either equal to application/x-yaml or
  application/ogcapppkg+yaml for the OGC Application Package <https://github.com/opengeospatial/ogcapi-processes/blob/master/extensions/deploy_replace_undeploy/standard/openapi/schemas/ogcapppkg.yaml> schema, or using application/cwl+yaml for a CWL-only definition. The definition will be loaded and converted to JSON for schema validation. Otherwise, JSON contents is assumed to be directly provided in the request payload for validation as previously accomplished.
• Add weaver.cwl_processes_dir configuration setting for preloading, registering or updating a set of
  known Process definitions from CWL files stored in a nested directory structure. This allows a service provider
  that uses Weaver to offer their Processes to directly maintain their definitions from the set of CWL files and
  upload changes in the web application at startup without need to manually undeploy and redeploy each Process.

Fixes

• Fix Process deployment using a WPS-1/2 URL reference defining a GetCapabilities request to resolve
  the corresponding DescribeProcess request if the Process ID can be inferred from other known locations
  (some items checked off from functional tests for process deployment #11).

References

• Fixes Deploy process directly with CWL content #434
• Relates to Increase test coverage #141
• Relates to functional tests for process deployment #11
• Relates to Register media type for CWL when OGC API - Processes - Part 2 is published opengeospatial/NamingAuthority#169
• Relates to register CWL descriptions with IANA & add to file's "magic" database common-workflow-language/common-workflow-language#421 (comment)

[codecov]

Codecov Report

Merging #443 (8a61134) into master (2f04613) will increase coverage by 0.13%.
The diff coverage is 93.20%.

@@            Coverage Diff             @@
##           master     #443      +/-   ##
==========================================
+ Coverage   81.50%   81.64%   +0.13%     
==========================================
  Files          76       75       -1     
  Lines       14541    14668     +127     
  Branches     3158     3188      +30     
==========================================
+ Hits        11851    11975     +124     
- Misses       1973     1975       +2     
- Partials      717      718       +1     

Impacted Files	Coverage Δ
weaver/base.py	100.00% <ø> (ø)
weaver/config.py	80.76% <ø> (ø)
weaver/datatype.py	74.97% <0.00%> (ø)
weaver/exceptions.py	91.96% <ø> (ø)
weaver/processes/builtin/__init__.py	83.33% <ø> (ø)
weaver/processes/convert.py	80.12% <ø> (ø)
weaver/tweens.py	77.94% <ø> (ø)
weaver/wps_restapi/providers/providers.py	80.64% <ø> (ø)
weaver/wps_restapi/quotation/quotes.py	68.36% <ø> (ø)
weaver/processes/wps_package.py	75.57% <87.09%> (+0.57%)	⬆️
... and 17 more

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