feat: Add rust_htslib::bcf::index::build #751

Job	Run time
Linting	1m 38s
Formatting	7s
Testing	7m 41s
Testing-Features (no-default-features)	1m 8s
Testing-MacOS (intel-catalina)	2m 29s
Testing-Features (all-features)	2m 21s
Testing-MacOS (intel-bigsur)	3m 52s
Testing-MacOS (m1-bigsur)	2m 43s
Testing-Features (musl-release-no-default-features)	2m 15s
Testing-Features (musl-release-all-features)	2m 21s
Testing-Features (musl-all-features)	2m 21s
	28m 56s

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