Proposal: Package elixir-ls as an escript

[Benjamin-Philip]

I have been procrastinating in making the switch from alchemist.el for a few months now.
I realised that the main reason that I have not made the switch yet is because I don't want to manually download and manage elixir-ls binaries as is the current norm.

Another project that I have contributed to, Livebook supports multiple methods of installation, which includes, cloning from source, installing an escript from hex, or as a docker image.

While I don't expect a docker image, I do think that having a installation option via mix escript.install would very useful, and less tedious than manually cloning from source and building the binaries / downloading release binaries.

Thus I have 2 questions:

1. Is this possible with elixir-ls? Is there any reason why this hasn't already been done?
2. Would a PR for such functionality be accepted?

[lukaszsamson]

Please continue discussion in #115