Add CRS parameter support to EDR API

[hk60418]

Overview

"crs" parameter is in the EDR spec and we need it in our custom provider here at Finnish Meteorological Institute. In this PR we just make the api pass it via the "crs_transform_spec".

Related Issue / discussion

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Additional information

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

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I agree to the pygeoapi Contributions and Licensing Guidelines.

• I have already previously agreed to the pygeoapi Contributions and Licensing Guidelines