Implement BiCGSTAB #542

Job	Run time
documentation	1m 49s
test (msrv, ubuntu-20.04, 1.64.0)	5m 32s
test (stable, ubuntu-20.04, stable)	2m 21s
clippy	2m 13s
benchmarks	3m 10s
test (beta, ubuntu-20.04, beta)	1m 45s
Optional features (approx selected)	1m 10s
Optional features (none selected)	48s
rustfmt	29s
test (nightly, ubuntu-20.04, nightly)	1m 50s
static SuiteSparse (stable, ubuntu-20.04, stable)	1m 15s
test (macos, macos-latest, stable)	4m 28s
static SuiteSparse (macos, macos-latest, stable)	2m 23s
test (win-msvc, windows-2019, stable)	2m 41s
Miri	2m 19s
static SuiteSparse (win-msvc, windows-2019, stable)	2m 23s
test (win-gnu, windows-2019, stable)	3m 20s
static SuiteSparse (win-gnu, windows-2019, stable)	2m 0s
	41m 56s

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