add symlink-based autotracing

[tobert]

Idea from #339 / @alsuren:

• have otel-cli recognize when it is symlinked and called with a different binary name
• create a directory of symlinks to otel-cli, aliasing commands in use on the system
• add the symlink dir to the front of path
• when otel-cli runs, it recognizes the symlink and searches the rest of the PATH for the real binary

Things to think about:

• what are the security implications? can this be abused?
• does traceparent passing make sense? how? Stick with simple otel-cli exec behavior?