array: more efficient conversion from ArrayValue to SparseArrayValue #202

Job	Run time
Check Semantic Versioning	2m 32s
Check Minimum Rust Version	15s
Unit Tests (stable, default)	43s
Unit Tests (stable, bigint)	51s
Unit Tests (stable, serde1)	50s
Unit Tests (stable, fraction1)	50s
Unit Tests (stable, rand1)	45s
Unit Tests (stable, bigint,serde1,fraction1,rand1)	57s
Unit Tests (beta, default)	43s
Unit Tests (beta, bigint)	49s
Unit Tests (beta, serde1)	51s
Unit Tests (beta, fraction1)	46s
Unit Tests (beta, rand1)	44s
Unit Tests (beta, bigint,serde1,fraction1,rand1)	57s
Unit Tests (nightly, default)	40s
Unit Tests (nightly, bigint)	47s
Unit Tests (nightly, serde1)	48s
Unit Tests (nightly, fraction1)	47s
Unit Tests (nightly, rand1)	43s
Unit Tests (nightly, bigint,serde1,fraction1,rand1)	54s
	17m 12s

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