Add editor configs

Add .editorconfig, .vscode and .gitattributes configs to make editors
and tools aware that the files use unix line indeings and are indentent
with tabs.

.editorconfig

@@ -0,0 +1,13 @@
+root = true
+
+[*.{js,jsx,mjs,cjs,ts,tsx,mts,cts}]
+charset = utf-8
+end_of_line = lf
+indent_size = tab
+indent_style = tab
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+*{.yaml,.yml}]
+indent_size = 2
+indent_style = space