chore: retrieve sdk version from env

[KeranYang]

Testing

Manually changed the numaflow platform MINIMUM_SUPPORTED_SDK_VERSIONS to ask for minimum rust version 0.0.2. Ran a monovertex and verified getting.

2024-09-08T20:08:56.033906Z  INFO monovertex::server_info: Server info file: ServerInfo { protocol: "uds", language: "rust", minimum_numaflow_version: "1.3.1", version: "0.0.1", metadata: Some({}) }
2024-09-08T20:08:56.034003Z  INFO monovertex::server_info: Version_info: VersionInfo { version: "latest+unknown", build_date: "1970-01-01T00:00:00Z", git_commit: "", git_tag: "", git_tree_state: "", go_version: "unknown", compiler: "", platform: "linux/aarch64" }
2024-09-08T20:08:56.034069Z  WARN monovertex: Error waiting for source server info file: ServerInfoError("SDK version 0.0.1 must be upgraded to at least 0.0.2, in order to work with the current numaflow version")
2024-09-08T20:08:56.034079Z ERROR monovertex: Application error: ForwarderError("Error waiting for server info file")
2024-09-08T20:08:56.034188Z  INFO monovertex: Gracefully Exiting...

Made this change, reran the monovertex, the error was gone.

Also used a unit test to verify the value of env!("CARGO_PKG_VERSION") is 0.1.1.