Adds getSimilar handler function

[bmquinn]

• Adds /works/{id}/similar endpoint
• Supports size and page query string parameters for pagination
• Adds tests for the new handler

Note: you can test this by adding several works to Meadow (more than 5 to be safe) that share a common term in one of the relevant fields such as description.

[mbklein]

@kdid Does this also resolve nulib/repodev_planning_and_docs#3103?

[kdid]

@kdid Does this also resolve nulib/repodev_planning_and_docs#3103?

I'll check