* Add `SessionExt` trait for friendlier methods
* Create `Mailbox` and internal `PostOffice` to manage responses to requests
* Refactor `Session` to use a new `SessionChannel` underneath
* Refactor `Response` to always include an origin_id field instead of being optional
* Update `ProcStdout`, `ProcStderr`, and `ProcDone` to include origin id
* Replace `verbose` option with `log-level`
* Remove DistantCodec
* Add Codec trait to support encode & decode
* Add XChaCha20Poly1305 dependency in place of orion
* Add XChaCha20Poly1305Codec that encrypts/signs using XChaCha20Poly1305
* Add PlainCodec that does no encrypting/signing
* Refactor Transport to take generic Codec
* Rewrite to no longer use blake256
* Remove k256 dependency
* Remove Transport::from_handshake as no longer doing EDCH key exchange
* Fix stdout/stderr being sent before proc_start by adding post_hook support to handler such that proc_run tasks are not spawned until proc_start is sent as response
* Remove unneeded else if condition when checking join error type
* Finish implementing new listener logic
* Refactor cli tests to work with new format
* Implement tests for remote process
* Fix bugs in LSP stdout, stderr, and stdin
* Add tests for LSP remote process
* Update metadata request & response to support resolving the file type of symlinks
Chip Senkbeil