API - Get Endpoints By Filter

The URL of the API is effectively the same as Get All Endpoints (/api/v1/endpoints/), except for one difference:
To get endpoints by filter, the user must specify a pair of query parameters: field & regex
e.g.

where:

• field is the name of the key from the root of the definition json (one of: class, name, produces, consumes, type, scheme, httpMethod, baseUrl, path, request, responses)

• regex is a POSIX Regular Expression https://www.postgresql.org/docs/9.3/functions-matching.html#FUNCTIONS-POSIX-TABLE