niri_ipc::Socket; niri msg version; version checking on IPC (#278)

* Implement version checking in IPC

implement version checking; streamed IPC

streamed IPC will allow multiple requests per connection

add nonsense request

change inline struct to json macro

only check version if request actually fails

fix usage of inspect_err (MSRV 1.72.0; stabilized 1.76.0)

"nonsense request" -> "return error"

oneshot connections

* Change some things around

* Unqualify niri_ipc::Transform

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Co-authored-by: Ivan Molodetskikh <yalterz@gmail.com>

niri-ipc/Cargo.toml

@@ -10,6 +10,7 @@ repository.workspace = true
 [dependencies]
 clap = { workspace = true, optional = true }
 serde.workspace = true
+serde_json.workspace = true
 
 [features]
 clap = ["dep:clap"]