openapi: Add dataclass for holding article path fields.
openapi: Add dataclass for holding article path fields.

The returned values of get_path function would be
expanded soon, and defining a dataclass would make
the code cleaner for returning and using the fields.

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