Implement BiCGSTAB #538

Job	Run time
documentation	2m 21s
clippy	57s
Optional features (none selected)	50s
Optional features (approx selected)	1m 14s
benchmarks	3m 1s
rustfmt	27s
test (msrv, ubuntu-20.04, 1.64.0)	6m 46s
Miri	2m 38s
test (stable, ubuntu-20.04, stable)	1m 54s
static SuiteSparse (stable, ubuntu-20.04, stable)	1m 5s
test (beta, ubuntu-20.04, beta)	2m 4s
test (nightly, ubuntu-20.04, nightly)	1m 50s
static SuiteSparse (macos, macos-latest, stable)	2m 8s
test (macos, macos-latest, stable)	2m 57s
static SuiteSparse (win-msvc, windows-2019, stable)	2m 26s
test (win-msvc, windows-2019, stable)	3m 19s
static SuiteSparse (win-gnu, windows-2019, stable)	1m 50s
test (win-gnu, windows-2019, stable)	3m 27s
	41m 14s

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