Add support for state_call JSON-RPC function

[tomaka]

cc paritytech/substrate-connect#1096

[mergify]

Automatically approving tomaka's pull requests. This auto-approval will be removed once more maintainers are active.

[github-actions]

twiggy diff report

Difference in .wasm size before and after this pull request.

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 Delta Bytes │ Item
─────────────┼────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
      +42930 ┊ smoldot::json_rpc::methods::MethodCall::from_defs::h090439a7b8e25d92
      -41864 ┊ smoldot::json_rpc::methods::MethodCall::from_defs::h9295beb16bc69022
      +10403 ┊ <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll::h11264ce31f3acef3
      -10089 ┊ <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll::h5909e667edc01070
       +4768 ┊ <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll::hff1e15df471ba380
       +4245 ┊ <smoldot::json_rpc::methods::MethodCall as core::fmt::Debug>::fmt::h7e77f9282aabea6e
       -4131 ┊ <smoldot::json_rpc::methods::MethodCall as core::fmt::Debug>::fmt::h69dc12246fd7c6b5
       +2284 ┊ <&mut serde_json::de::Deserializer<R> as serde::de::Deserializer>::deserialize_struct::h5240242da21d3cdb
       +1582 ┊ <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll::h25e0c2c09f38a050
       +1348 ┊ core::ptr::drop_in_place<core::future::from_generator::GenFuture<smoldot_light_base::json_rpc_service::Background<smoldot_light_wasm::platform::Platform>::handle_request::{{closure}}>>::h52b3ceb92ac6b44d
       -1318 ┊ core::ptr::drop_in_place<core::future::from_generator::GenFuture<smoldot_light_base::json_rpc_service::Background<smoldot_light_wasm::platform::Platform>::handle_request::{{closure}}>>::hf8cb8d6f1699faa2
       +1208 ┊ <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll::h6fb5d604fb93f46e
       +1186 ┊ <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll::h0acb01bb6bdbce09
       +1174 ┊ <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll::hca2116a48455916b
        +948 ┊ smoldot::executor::host::HostVmPrototype::run_vectored::h88c0b83edebf77a5
        +551 ┊ core::ptr::drop_in_place<smoldot::json_rpc::methods::MethodCall>::hfb4598374b1f297a
        -525 ┊ core::ptr::drop_in_place<smoldot::json_rpc::methods::MethodCall>::hd89dfbc4a4e14bdf
        +519 ┊ <serde_json::de::MapAccess<R> as serde::de::MapAccess>::next_key_seed::hbdc93a9f51d514a7
        +485 ┊ <core::iter::adapters::chain::Chain<A,B> as core::iter::traits::iterator::Iterator>::fold::h37d03f8ff0bbadde
        +464 ┊ <core::iter::adapters::chain::Chain<A,B> as core::iter::traits::iterator::Iterator>::fold::h18e97954256099f0
       +2286 ┊ ... and 28 more.
      +22465 ┊ Σ [48 Total Rows]

[melekes]

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