bug#61996: 30.0.50; Submitting elixir-ts-mode and heex-ts-mode

[Wilhelm Kirschbaum]

I would like to submit elixir-ts-mode and heex-ts-mode to emacs 
master.

The package elixir-ts-mode and its dependency heex-ts-mode is
currently a melpa package: https://melpa.org/#/elixir-ts-mode. 
This is a
slightly simplified version, also authored by me.

There is one change not authored by me:
https://github.com/wkirschbaum/elixir-ts-mode/commit/21ad74877ebb55f4bf0b31c2f463bbfda72590ef
which is a duplication removal.

I completed the assignment process in Jan.

0001-Add-heex-ts-mode.patch
Description: Add heex-ts-mode

0002-Add-elixir-ts-mode.patch
Description: Add elixir-ts-mode