quote-estimator integration

[fmigneault]

Changes

• Add weaver.quotation = true|false setting that allows control over the activation of all endpoints and operations
  related to the OGC API - Processes https://github.com/opengeospatial/ogcapi-processes/tree/master/extensions/billing and https://github.com/opengeospatial/ogcapi-processes/tree/master/extensions/quotation extensions.
• Add support to configure a quotation estimation algorithm for each respective Process with new requests
  using GET, PUT, DELETE methods on /processes/{processID}/estimator endpoint. The configured
  algorithm is provided by a reference Docker image defined by weaver.quotation_docker_[...] settings.
  The algorithm itself expects a highly customizable configuration to estimate quotation parameters based on
  conceptual categories, as defined by the ./schemas/quotation/quote-estimator.yaml schema optionally using versatile definitions.
  The Docker operation should return a JSON matching the ./schemas/quotation/quote-estimation-result.yaml schema, which is parsed and included in the produced Quote based on provided Process execution parameters.
• Add Process execution I/O pre-validation against the Process description before submitting the Job to avoid
  unnecessary allocation of computing resources for erroneous cases that can easily be detected in advance.
• Add $schema references to source OGC API - Processes or other schema registries for applicable content
  definitions in responses.
• Add missing OGC API - Processes schema references with published definitions
  under https://schemas.opengis.net/ogcapi/processes/part1/1.0/ when applicable.
• Add links request query parameter to /processes and /providers/{providerID}/processes listing to
  provide control over reporting of links for each Process summary item. By default, link=true and
  automatically disable it when detail=false is specified.
• Add missing 405 response schema for all OpenAPI endpoints as handled by the API when the requested HTTP method
  is not applicable for the given path.

Fixes

• Fix schema meta fields (title, summary, description, etc.) not being rendered in OpenAPI output for
  keyword schemas (allOf, anyOf, oneOf, not).
• Fix schema definitions not being rendered in OpenAPI into the requested order
  by _sort_first and _sort_after control attributes.

[fmigneault]

@francisPLT
Feel free to re-review whenever you want (or not if you don't have the time, it's fine). I will close it by the end of the week.
Since your last review, changes are mostly only to fix issues identified with more robust tests. There are also many linting patches.

[codecov]

Codecov Report

Merging #531 (9ffa669) into master (bcd8287) will increase coverage by 0.10%.
The diff coverage is 83.30%.

@@            Coverage Diff             @@
##           master     #531      +/-   ##
==========================================
+ Coverage   84.29%   84.39%   +0.10%     
==========================================
  Files          78       79       +1     
  Lines       16865    17596     +731     
  Branches     2565     2670     +105     
==========================================
+ Hits        14216    14850     +634     
- Misses       1952     2017      +65     
- Partials      697      729      +32     

Impacted Files	Coverage Δ
weaver/formats.py	88.44% <ø> (ø)
weaver/processes/builtin/__init__.py	88.79% <ø> (ø)
weaver/processes/esgf_process.py	0.00% <ø> (ø)
weaver/processes/opensearch.py	60.12% <ø> (ø)
weaver/processes/wps_process_base.py	84.51% <ø> (ø)
weaver/processes/wps_workflow.py	88.50% <ø> (ø)
weaver/wps/service.py	84.44% <ø> (ø)
weaver/wps/utils.py	82.44% <ø> (ø)
weaver/wps_restapi/constants.py	100.00% <ø> (ø)
weaver/wps_restapi/patches.py	100.00% <ø> (ø)
... and 27 more

... and 1 file with indirect coverage changes

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