feat(julia): Add julia support (#185)

Add support for julia function and structs + test cases included.

Closes #184 

---------

Co-authored-by: josephsdavid <josephsd@smu.edu>
Co-authored-by: Daniel Mathiot <d.danymat@gmail.com>

tests/minimal_init.lua

@@ -21,13 +21,13 @@ require("plenary.busted")
 
 vim.cmd("runtime plugin/nvim-treesitter.lua")
 
--- Some tests require the Python parser
--- vim.cmd([[TSInstallSync! python]])
-require("nvim-treesitter.configs").setup({
-    ensured_installed = {
-        "python",
-        "lua"
-    }
-})
+-- -- Some tests require the Python parser
+-- -- vim.cmd([[TSInstallSync! python]])
+-- require("nvim-treesitter.configs").setup({
+--     ensured_installed = {
+--         "python",
+--         "lua"
+--     }
+-- })
 
 require("neogen").setup({ snippet_engine = "nvim" })