app-server: Add streaming and tty/pty capabilities to command/exec (#13640)

* Add an ability to stream stdin, stdout, and stderr
* Streaming of stdout and stderr has a configurable cap for total amount
of transmitted bytes (with an ability to disable it)
* Add support for overriding environment variables
* Add an ability to terminate running applications (using
`command/exec/terminate`)
* Add TTY/PTY support, with an ability to resize the terminal (using
`command/exec/resize`)

codex-rs/app-server-protocol/src/protocol/mappers.rs

@@ -1,14 +1,22 @@
 use crate::protocol::v1;
 use crate::protocol::v2;
-
 impl From<v1::ExecOneOffCommandParams> for v2::CommandExecParams {
     fn from(value: v1::ExecOneOffCommandParams) -> Self {
         Self {
             command: value.command,
+            process_id: None,
+            tty: false,
+            stream_stdin: false,
+            stream_stdout_stderr: false,
+            output_bytes_cap: None,
+            disable_output_cap: false,
+            disable_timeout: false,
             timeout_ms: value
                 .timeout_ms
                 .map(|timeout| i64::try_from(timeout).unwrap_or(60_000)),
             cwd: value.cwd,
+            env: None,
+            size: None,
             sandbox_policy: value.sandbox_policy.map(std::convert::Into::into),
         }
     }