Improve `x-ogc-*` metadata reporting

[fmigneault]

Description

Multiple x-ogc-* properties can be returned, along the schema of I/O definitions, to help clients interpret the contents.

Additional element	Description
x-ogc-codelistUri	A reference to a codelist.
x-ogc-collectionId	Target collection of foreign key references.
x-ogc-definition	Reference to the semantic definition of a property.
x-ogc-propertySeq	An integer representing the relative position of a property in a schema in ascending order.
x-ogc-role	Declares a specific role of a property.
x-ogc-unit	Declares the unit of measure of a property.
x-ogc-unitLang	Declares the language /register used for the units of measure.
x-ogc-uriTemplate	A URI template with a template featureId used to reference a resources in another local or remote collection.

See Table of extensions to the JSON Schema vocabulary for the most up-to-date list of proposed properties.

Feature

• Whenever possible or relevant, these should be reported if they can be automatically detected (e.g.: using a UoM that contains unit and value should define the x-ogc-unit, common list of enum values referenced by some URI should provide x-ogc-codelistUri, collection outputs (Support OGC-API Processes - Part 3: Collection Outputs #683) should provide x-ogc-collectionId, etc.).

• Explicitly provided x-ogc-* properties in deployed processes should be preserved.

• Processes should allow update of I/O definitions providing new/modified x-ogc-* properties

References

• Part 5: Add table of x-ogc- properties opengeospatial/ogcapi-features#945
• https://docs.ogc.org/DRAFTS/23-058r1.html#_requirements_and_recommendations_for_schemas
• https://github.com/opengeospatial/ogcapi-common/wiki/Table-of-extensions-to-the-JSON-Schema-vocabulary