Option to install `coder` CLI on PATH

[bpmct]

People who use the VS Code extension may want to use the coder CLI outside of VS Code, but want to leverage VS Code for installing it and keeping it up-to-date.

We might want to make this configurable as a deployment-wide flag, but could also leave it up to the user to disable this behavior (perhaps as a VS Code setting).

[bpmct]

We can do it like this and symlink :)

[matifali]

That will be good to have.

[code-asher]

I wonder if it is sufficient that users can already set the binary destination? They could set it somewhere inside PATH.