chore: switch to gts for linting and formatting

Author: EndBug

.editorconfig

@@ -0,0 +1,8 @@
+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+end_of_line = lf
+charset = utf-8
+insert_final_newline = true

.eslintignore

@@ -0,0 +1 @@
+lib/

.eslintrc.js

@@ -0,0 +1,3 @@
+{
+  "extends": "./node_modules/gts/"
+}

.eslintrc.json

@@ -0,0 +1,3 @@
+module.exports = {
+  ...require('gts/.prettierrc.json')
+}