New shim metadata to allow many plugins with same executable names
New shim metadata to allow many plugins with same executable names

Features

* New shim version meta-data allows shims to not depend on a particular plugin
  nor on its relative executable path (#431)
  Upgrading requires shim re-generation and should happen automatically
  by `asdf-exec`:
    `rm -rf ~/.asdf/shims/` followed by `asdf reshim`
* Added lots of tests for shim execution.
  We now make sure that shim execution obeys plugins hooks like
  `list-bin-paths` and `exec-path`.
* Shim exec is now performed by a new `bin/private/asdf-tool-exec` that might
  be faster for most common use case: (versions on local .tool-versions file)
  but fallbacks to slower `get_preset_version_for` which takes legacy formats
  into account.
* Shim exec recommends which plugins or versions to set when command is
  not found.

Fixed Bugs

* Allow many plugins to provide shims with same executable name (#431)

asdf-vm/asdf,Stratus3D/asdf