Change value array type from std::vector to std::shared_ptr<Float*>
Impl. dense/sparse tensor type

For more detail in Changelog.

Added

• Add tensor (tensor_Dense & tensor_COO) https://gitlab.ritc.jp/ricos/monolish/-/merge_requests/492 https://github.com/ricosjp/monolish/issues/724
• Add mattens functions as blas-like operation https://gitlab.ritc.jp/ricos/monolish/-/merge_requests/495 https://github.com/ricosjp/monolish/issues/727
• Add view1D of tensor_Dense https://gitlab.ritc.jp/ricos/monolish/-/merge_requests/496 https://github.com/ricosjp/monolish/issues/728
• Add variadic templates for reshape tensor https://gitlab.ritc.jp/ricos/monolish/-/merge_requests/499 https://github.com/ricosjp/monolish/issues/730

Changed

• Start developing 0.17.1 https://gitlab.ritc.jp/ricos/monolish/-/merge_requests/487
• std::vector -> std::shared_ptr for data array https://gitlab.ritc.jp/ricos/monolish/-/merge_requests/491
• Change operator[] as val.get()[] of value array https://gitlab.ritc.jp/ricos/monolish/-/merge_requests/494 https://github.com/ricosjp/monolish/issues/726

Full Changelog: 0.17.0...0.17.1