Update code companion to use copilot claude sonnet 3.7, add support for

gemini and openai with api keys. Additionally add code companion.
Finally, add VectorCode with Code Companion which caches and gives
context of private local projects to AI for better insight.
completion in blink.

nvim/lua/plugs/blink.lua

@@ -16,7 +16,10 @@ return {
         -- Default list of enabled providers defined so that you can extend it
         -- elsewhere in your config, without redefining it, due to `opts_extend`
         sources = {
-            default = { "lsp", "path", "snippets", "buffer" },
+            default = { "lsp", "path", "snippets", "buffer", },
+            per_filetype = {
+                codecompanion = { "codecompanion", },
+            },
         },
 
         -- (Default) Rust fuzzy matcher for typo resistance and significantly better performance