Kv regex scan

[milos-lk]

Introducing small helper to extract typed values from strings via regex (e.g., Uint64, Int64, Bool, DurationNs, String).
Syntactic sugar.

An example of a function implementation this change:

func parseStatsString(s string) (OpusDecStats, error) {
	var st OpusDecStats

	getU64 := func(k string) (uint64, error) {
		if m := reU64[k].FindStringSubmatch(s); len(m) == 2 {
			return strconv.ParseUint(m[1], 10, 64)
		}
		return 0, fmt.Errorf("missing %s", k)
	}
	getU32 := func(k string) (uint32, error) {
		if m := reU32[k].FindStringSubmatch(s); len(m) == 2 {
			v, _ := strconv.ParseUint(m[1], 10, 32)
			return uint32(v), nil
		}
		return 0, fmt.Errorf("missing %s", k)
	}

	// Required
	if v, err := getU64("num-pushed"); err == nil {
		st.NumPushed = v
	}
	if v, err := getU64("num-gap"); err == nil {
		st.NumGap = v
	}
	return st, nil
}

and after:

func parseStatsString(s string) (OpusDecStats, error) {
	kv := utils.NewKVRegexScanner(serialized)

	var st OpusDecStats
	if v, ok := kv.Uint64(rePushed); ok { st.NumPushed = v }
	if v, ok := kv.Uint64(reGap); ok    { st.NumGap = v }
	if v, ok := kv.Uint64(rePLCs); ok   { st.PlcNumSamples = v }
	if d, ok := kv.DurationNs(rePLCn); ok { st.PlcDuration = d }
	return st, nil
}

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