Updated default value of the maps crs parameter on OpenAPI definition

[doublebyte1]

Overview

The OpenAPI definition presents the OAM CRS parameter as an integer, rather than string. The support to passing CRS as an integer was removed, as this is against the recommendations of the standard. In the current implementation, a CRS must be in the form of a uri, a CURIE or a safe CURIE (See more details about what is supported here).

Related Issue / discussion

#1808

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

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