Add suport for type on code selection.

This adds in initial support, but this issue in Metals
should be merged in first: scalameta/metals#3178.

Closes scalameta#228

lua/metals.lua

@@ -370,6 +370,34 @@ M.show_javap_verbose = function()
   ))
 end
 
+M.type_of_range = function()
+  --local _, start_line_num, start_col_num, _ = unpack(vim.fn.getpos("'<"))
+  --local _, end_line_num, end_col_num, _ = unpack(vim.fn.getpos("'>"))
+
+  -- Using this is so inconsistent it's crazy
+  --local start = vim.api.nvim_buf_get_mark(0, "<")
+  --local vend = vim.api.nvim_buf_get_mark(0, ">")
+
+  --Params: {
+  --  "textDocument": {
+  --    "uri": "file:///Users/ckipp/Documents/scala-workspace/sanity/src/main/scala/Thing.scala"
+  --  },
+  --  "range": {
+  --    "start": {
+  --      "line": 10,
+  --      "character": 1
+  --    },
+  --    "end": {
+  --      "line": 10,
+  --      "character": 11
+  --    }
+  --  }
+  --local range = vim.lsp.util.make_given_range_params({ start_line_num, start_col_num }, { end_line_num, end_col_num })
+
+  --P(vim.lsp.util.make_range_params())
+  vim.lsp.buf_request(0, "textDocument/hover", vim.lsp.util.make_given_range_params())
+end
+
 -- Since we want metals to be the entrypoint for everything, just for ensure that it's
 -- easy to set anything for users, we simply include them in here and then expose them.
 M.bare_config = setup.bare_config