Add version option or command to bpfman CLI tools

[frobware]

Currently, the bpfman CLI tools do not provide a way to check their version (e.g., via bpfman --version or bpfman version). This makes it difficult to identify which version/commit of the tools is running both during development and when users report issues.

[frobware]

I explored what build information would be useful and prototyped it here: build-rs-example. This example uses a single build.rs to embed BUILD_VERSION, BUILD_DATE, and BUILD_TOOLCHAIN. Do we need more than that for bpfman? What's unclear to me is how to integrate a single build.rs across all the bpfman binaries.