add bit_set_intervals function #163

Job	Run time
Check Minimum Rust Version	13s
Check Semantic Versioning	2m 24s
Unit Tests (stable, default)	37s
Unit Tests (stable, bigint)	1m 4s
Unit Tests (stable, serde1)	49s
Unit Tests (stable, fraction1)	44s
Unit Tests (stable, bigint,serde1,fraction1)	53s
Unit Tests (beta, default)	42s
Unit Tests (beta, bigint)	52s
Unit Tests (beta, serde1)	53s
Unit Tests (beta, fraction1)	48s
Unit Tests (beta, bigint,serde1,fraction1)	1m 0s
Unit Tests (nightly, default)	42s
Unit Tests (nightly, bigint)	54s
Unit Tests (nightly, serde1)	50s
Unit Tests (nightly, fraction1)	47s
Unit Tests (nightly, bigint,serde1,fraction1)	59s
	15m 11s

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