openapi: Add curl examples' configurations in OpenAPI data.
openapi: Add curl examples' configurations in OpenAPI data.

As a goal of moving towards a common template,
we need to fetch curl examples' configurations
directly from openapi data instead of having them
hardcoded in templates. This commit introduces
x-curl-examples-parameters to store the configs
for the same.

hackerkid/zulip,hackerkid/zulip,andersk/zulip,hackerkid/zulip,rht/zulip,zulip/zulip,punchagan/zulip,punchagan/zulip,hackerkid/zulip,rht/zulip,rht/zulip,andersk/zulip,eeshangarg/zulip,zulip/zulip,eeshangarg/zulip,zulip/zulip,eeshangarg/zulip,kou/zulip,hackerkid/zulip,hackerkid/zulip,rht/zulip,hackerkid/zulip,kou/zulip,zulip/zulip,kou/zulip,rht/zulip,eeshangarg/zulip,punchagan/zulip,zulip/zulip,zulip/zulip,punchagan/zulip,andersk/zulip,punchagan/zulip,eeshangarg/zulip,eeshangarg/zulip,kou/zulip,punchagan/zulip,zulip/zulip,punchagan/zulip,eeshangarg/zulip,andersk/zulip,rht/zulip,andersk/zulip,kou/zulip,andersk/zulip,andersk/zulip,rht/zulip,kou/zulip,kou/zulip