add search with capture meta key value pair

[kortemik]

Description
add search with capture meta key value pair

Use case or motivation behind the feature request
currently it is only possible to store and fetch capture metas by id or get all, however it is quite likely that one would like to search with key value pair to receive a list of capture_definitions that have this key-value pair

Related issues
#68

Additional context

[Nefarious46]

Currently under implementation with the endpoints somewhat done and E2E testing required. Currently takes key and value as input values and returns capture_id, tag, sourcetype, application and index for the end user.