[Feature] OpenAPI 3.1

[elliot-huffman]

Updated the following files:

• spec/SHIELD.json
• spec/Data-Gateway.json

For the following:

• Rename example fields to examples.

For examples field inside each schema and each individual property in schema:

• Wrap all existing example field values with array (Any[]).
• Replace the array values with a single value value in the first item of the original array.

For examples field outside schema (e.g. MediaContentType objects in PathItem > Operation > Request ):

• Use Map[string, Example] instead to conform OpenAPI specification version 3.1

• Both files loaded in SwaggerEditor, showing no warnings or errors.

• Example options should be available on each API's request, response and parameter section, with summary as option label and description showing as Example description content.

Please see here for the original PR:
#18

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