* WIP extract RPCs into separate crate
* fmt
* Fix test
* Remove unused deps
* fix import
* WIP: Fix up errors and most tests. Start extracintg some tests/code to rpc crate
* MockRpcClient sync or async
* MockRpcClient only async but better type inference
* WIP MockRpcClient FnMuts and some test updates to use it
* Get all but one test working with new MockRpcClient
* WIP trying to debug failure
* WIP, Tests mostly fixed, need to add back oen more
* Get mock RPC tests working
* fmt
* fmt
* Clippy and comment tweak
* update CI to explicitly check subxt-rpc features
* clippy
* small tweaks after pass over
* feature flag rename
* update some docs
* Fix some examples
* fmt
* Fix features flags to work with web/wasm32
* Fix unused dep warning
* explicit targets in wasm CI
* Add better crate level docs
* fmt
* Address review comments
* Comment out flaky test for now and make more obvious how similar POlkadot and Substrate configs are
* Not a doc comment
* Remove unused imports
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