feat(graphql): filter active recordings by various properties

[andrewazores]

Fixes #823

Allows querying active recordings with filters on name, state, startTime (before or after timestamp inclusive), duration (greater/equal or lesser/equal to duration), continuous, toDisk, and the value of the "template" metadata label if any.

Example query for recordings using the Profiling template which have already stopped, running on Cryostat's own JVM:

query {
    targetNodes(filter: { name: "service:jmx:rmi:///jndi/rmi://localhost:9091/jmxrmi" }) {
        recordings {
            active(filter: {
                state: "STOPPED",
                templateLabel: "template=Profiling,type=TARGET"
                }) {
                name
                state
                startTime
                duration
                continuous
                toDisk
                maxSize
                maxAge
                metadata {
                    labels
                }
                reportUrl
                downloadUrl
            }
        }
    }
}

[jan-law]

All the active recording filters with run.sh are working well

[hareetd]

Works well, I didn't run into any OOM issues with smoketest.