Add articles endpoint to our main API that will allow our users to query specific article(s) by name so that they can pick a specific article names and query them instead of filtering them out from other product offerings.

Acceptance criteria
Articles endpoint present and functional inside the API.

To-Do

• create /v2/articles/*name endpoint under wikimedia-enterprise/api/main repository
• add unit tests
• add integration tests

Notes
Please take a look at documentation/api-specs-v2 it has NewGetManyLarge handler under handlers package that has all the functionality needed.