move code out to a new signal-cli-jsonrpc-client

this makes it easier to reuse the RPC stuff and the signal trust set stuff

signal-cli-jsonrpc-client/README.md

@@ -0,0 +1,32 @@
+# signal-cli-jsonrpc-client
+
+A Rust JSON-RPC client for [signal-cli](https://github.com/AsamK/signal-cli) daemon.
+
+## Origin
+
+The RPC interface and transport code in this crate is based on the example client code from the signal-cli repository:
+
+- <https://github.com/AsamK/signal-cli/blob/master/client/src/jsonrpc.rs>
+
+## Usage
+
+```rust
+use signal_cli_jsonrpc_client::{connect_tcp, RpcClient};
+
+// Connect to signal-cli daemon via TCP
+let client = connect_tcp("127.0.0.1:7583").await?;
+
+// Use the RpcClient trait methods
+let version = client.version().await?;
+```
+
+## Features
+
+- TCP transport for connecting to signal-cli daemon
+- Unix domain socket transport (on Unix systems)
+- Full RPC interface matching signal-cli's JSON-RPC API
+- Helper types for sending messages and handling received messages
+
+## License
+
+MIT or Apache 2.0 at your option.