Check config key

[yhmtsai]

This PR adds the check to verify the keys in config are allowed by predefined keys set.
typo in config is quite easy in the file because we do not have auto-complete for that
It avoids typo or misusage of parameters from user such that the configuring solver is not what users expect without notice.

Isome thoughts will be nice.
allowed_keys preparation: predefine it as early as possible or insert the key into the set close to the condition
I am predefining it as early as possible. but I think the second way might makes sense when the class has long list of keys like multigrid. It makes the manual type together and reduce the chance that missing deleting one of condition and allowed key. The first one is somehow easy to set with constructor not many lines of set.insert("key")

[ginkgo-bot]

Error: The following files need to be formatted:

common/cuda_hip/matrix/ell_kernels.cpp
common/cuda_hip/matrix/sellp_kernels.cpp
common/cuda_hip/matrix/sparsity_csr_kernels.cpp
common/unified/matrix/dense_kernels.template.cpp
core/matrix/csr.cpp
core/test/matrix/csr.cpp
dpcpp/matrix/csr_kernels.dp.cpp
dpcpp/matrix/ell_kernels.dp.cpp
dpcpp/matrix/sellp_kernels.dp.cpp
dpcpp/matrix/sparsity_csr_kernels.dp.cpp
include/ginkgo/core/matrix/csr.hpp
omp/matrix/csr_kernels.cpp
omp/matrix/dense_kernels.cpp
omp/matrix/ell_kernels.cpp
omp/matrix/fbcsr_kernels.cpp
omp/matrix/sellp_kernels.cpp
omp/matrix/sparsity_csr_kernels.cpp
reference/matrix/csr_kernels.cpp
reference/matrix/dense_kernels.cpp
reference/matrix/ell_kernels.cpp
reference/matrix/fbcsr_kernels.cpp
reference/matrix/sellp_kernels.cpp
reference/matrix/sparsity_csr_kernels.cpp
reference/test/matrix/csr_kernels.cpp
reference/test/matrix/dense_kernels.cpp
reference/test/matrix/ell_kernels.cpp
reference/test/matrix/sellp_kernels.cpp
reference/test/matrix/sparsity_csr_kernels.cpp
test/factorization/ic_kernels.cpp
test/factorization/ilu_kernels.cpp
test/matrix/csr_kernels2.cpp
test/matrix/matrix.cpp

You can find a formatting patch under Artifacts here or run format! if you have write access to Ginkgo