ExecutableRequirement support for version

ExecutableRequirement can support a version argument by also having an argument to supply the CLI argument which can be used to request the version, and a regex to parse the version from the output.

This will mean we can almost always add a version to the bear metadata, for any linter which has a CLI, but more importantly also add minimum versions for the runtimes like node, go, etc, as people often install these using managers other than the OS supplied package managers.