Create get_parameters in BaseEDRProvider

[webb-ben]

Overview

Migrate creation of CoverageJSON Parameters object to BaseEDRProvider to allow downstream providers to control the creation of the parameters representation at the .../collections/{collection_id} endpoint.

Related Issue / discussion

Addresses #2362

Additional information

This allow allows for a unified implementation of CovJSON parameters between the parameters offered at the metdata endpoint and the literal parameters returned by the provider. This is demonstrated in the implementation of the get_parameters function for Coverages returned by the Xarray provider.

Dependency policy (RFC2)

• I have ensured that this PR meets RFC2 requirements

Updates to public demo

• I have ensured that breaking changes to the pygeoapi master demo server have been addressed
  • https://github.com/geopython/demo.pygeoapi.io/blob/master/services/pygeoapi_master/local.config.yml

Contributions and licensing

(as per https://github.com/geopython/pygeoapi/blob/master/CONTRIBUTING.md#contributions-and-licensing)

• I'd like to contribute [feature X|bugfix Y|docs|something else] to pygeoapi. I confirm that my contributions to pygeoapi will be compatible with the pygeoapi license guidelines at the time of contribution
• I have already previously agreed to the pygeoapi Contributions and Licensing Guidelines