Add #![no_std] to the runtime crate and introduce optional std and
alloc features. Update the code generator to be compatible and add a
no_std_test example. Remove the generator binary.
Include package names in the `NamedService` identifier and request
paths. Change generated imports to use `crate` and add `tokio` and
`tokio-stream` dependencies to `roto-tonic`.
Change StatusBody from a tuple struct to a struct containing both data
and trailers. Update the codegen to use the new StatusBody::new
constructor to specify gRPC status codes.
Also remove the temp_test_project.
Correct module paths and accessor usage in the generator to ensure
generated code builds. Add a test that verifies this by compiling the
generated code in a temporary project.
Resolve `Result` ambiguity and lifetime issues in generated services.
Use `file_stem` for proto filenames. Make `StatusBody` public in
`roto-tonic` and update the `hello_world` build process.
charles