`promtool`: parse extended range selectors

### Proposal

Promtool does not support [promql-extended-range-selectors](https://prometheus.io/docs/prometheus/latest/feature_flags/#extended-range-selectors), so it can't check rules files using the new syntax:

https://github.com/prometheus/prometheus/blob/2437977bffc82b76ec298622ddb2904bfd70b9df/cmd/promtool/main.go#L347-L360

Looks like it could also use support for [promql-duration-expr](https://prometheus.io/docs/prometheus/latest/feature_flags/#promql-arithmetic-expressions-in-time-durations), but I can't personally vouch for that.

	for _, f := range *featureList {
	for o := range strings.SplitSeq(f, ",") {
	switch o {
	case "promql-experimental-functions":
	parser.EnableExperimentalFunctions = true
	case "promql-delayed-name-removal":
	promqlEnableDelayedNameRemoval = true
	case "":
	continue
	default:
	fmt.Printf(" WARNING: Unknown feature passed to --enable-feature: %s", o)
	}
	}
	}

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`promtool`: parse extended range selectors #17922

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promtool: parse extended range selectors #17922

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`promtool`: parse extended range selectors #17922