analyse: consider add ability to pass --time-range (or --from, --to) flag

[Dentrax]

Currently, we can't set the default time range (window) between start and end times.

$ cortextool analyse prometheus --address http://10.10.10.10:30090 --log.level="debug"

INFO[0000] log level set to debug
cortextool: error: error querying for metric names: Get "http://10.10.10.10:30090/api/v1/label/__name__/values?end=1642510924.832703&start=1642510324.832703": dial tcp 10.10.10.10:30090: connect: operation timed out, try --help

The default duration between two times is 10 minutes: end=1642510924.832703&start=1642510324.832703

prometheusAnalyseCmd.Flag("time-range", "duration time range").
		Default("10m").
		DurationVar(&paCmd.timeRange)

// same for grafana and ruler?

@eminaktas @yasintahaerol