Change Details

This is done in preparation for the following commit. Also rename it to SignatureCache. This is a partial backport of core#30141 https://github.com/bitcoin/bitcoin/pull/30141/commits/66d74bfc45ae0f743084475ac3bbfb4355bb6ec2 Depends on D18858

This is done in preparation for the following commit. Also rename it to SignatureCache. This is a partial backport of [[https://github.com/bitcoin/bitcoin/pull/30141 | core#30141]] https://github.com/bitcoin/bitcoin/pull/30141/commits/66d74bfc45ae0f743084475ac3bbfb4355bb6ec2 Depends on D18858

This is done in preparation for the following commit. Also rename it to SignatureCache. This is a partial backport of [[https://github.com/bitcoin/bitcoin/pull/30141 | core#30141]] https://github.com/bitcoin/bitcoin/pull/30141/commits/66d74bfc45ae0f743084475ac3bbfb4355bb6ec2 Depends on D18858