* WIP backend trait
* WIP converting higher level stuff to using Backend impl
* more implementing new backend trait, mainly storage focused
* Get core code compiling with new backend bits
* subxt crate checks passing
* fix tests
* cargo fmt
* clippy/fixes
* merging and other fixes
* fix test
* fix lightclient code
* Fix some broken doc links
* another book link fix
* fix broken test when moving default_rpc_client
* fix dry_run test
* fix more tests; lightclient and wasm
* fix wasm tests
* fix some doc examples
* use next() instead of next_item()
* missing next_item() -> next()s
* move legacy RPc methods to LegacyRpcMethods type to host generic param instead of RpcClient
* standardise on all RpcClient types prefixed with Rpc, and 'raw' trait types prefixed with RawRpc so it's less ocnfusing which is which
* rename fixes
* doc fixes
* Add back system_dryRun RPC method and rename tx.dry_run() to tx.validate(), to signal that the calls are different
* Add a test that we return the correct extrinsic hash from submit()
* add TransactionValid details back, and protect against out of range bytes
* add test for decoding transaction validation from empty bytes
* fix clippy warning
* parachain rpc lists
* guide almost done
* add the 3rd config
* subscribe to block with configs
* delete table file
* spaces instead of tabs
* remove original ajuna example
* zombienet setup
* nft minting example
* include port, use different names
* link the example from the book
* format book
* add config creation to book, simplify example structure
* fix the nft creation script
* fix doc ref
* fixing links to foreign crates
* fix table formatting
* include nits
* move more docs to book, and simplify parachain-example
* another pass over docs and link to exampels from guide
* nit: adjust comment to numbers
* teeny README fix for parachain-example
* fix command in readme
* add CI for examples and fix parachain-example bug I left in
* add target arch
* cargo fmt
* make CI not fail
* remove index from docs
---------
Co-authored-by: James Wilson <james@jsdw.me>