* WIP second pass over light client code for simpler API
* First pass new light client
* pub(crate) LightClientRpc::new_raw(), and fmt
* Update examples and add back a way to configure boot nodes and fetch chainspec from a URL
* Fix light client examples
* remove unused deps and tidy lightclient feature flags
* fix wasm error
* LightClientRpc can be cloned
* update light client tests
* Other small fixes
* exclude mod unless jsonrpsee
* Fix wasm-lightclient-tests
* add back docsrs bit and web+native feature flag compile error
* update book and light client example names
* fix docs
James Wilson