* First pass converting historic metadatas to our subxt::Metadata type
* use published frame-decode
* fmt and rename legacy metadata macro
* Enable legacy feature where needed in subxt_metadata so it compiles on its own
* Use cargo hack more in CI and fix subxt-metadata features
* Add tests for metadata conversion (need to optimise; some too expensive right now
* Address performance and equality issues in metadata conversion testing
* fmt
* fmt all
* clippy
* Fix a doc link
* Test codegen and fixes to make it work
* Remove local frame-decode patch
* bump frame-decode to latest
