Add Route to Fetch Blocks by Tenure Height

[bowtiedbot]

Add a route that opens an endpoint on the API that allows users to fetch the blocks by tenure height:

/extended/v2/tenure-height/{height}/blocks

This endpoint returns the same data as /extended/v2/burn-blocks/{height_or_hash}/blocks does, but by the tenure height instead of the burn height/hash.

[CLAassistant]

All committers have signed the CLA.