Remove lodash deps (#13057)

* inline escapeRegExp instead of using any dep

* inline camelCase

* replace merge with object spread

* copy if array instead of using clone

* inline isRegExp

* review fixes!

* remove escape-string-regexp from package.json and in test

* add error for field defaults that are not primitives or empty arrays

* replace merge with object spread

* yarn

packages/babel-core/src/config/helpers/escape-regexp.cjs

@@ -1,5 +0,0 @@
-"use strict";
-
-module.exports = process.env.BABEL_8_BREAKING
-  ? require("escape-string-regexp")
-  : require("lodash/escapeRegExp");

packages/babel-core/src/config/pattern-to-regex.js

@@ -1,9 +1,6 @@
 // @flow
 import path from "path";
 
-// $FlowIgnore
-import escapeRegExp from "./helpers/escape-regexp.cjs";
-
 const sep = `\\${path.sep}`;
 const endSep = `(?:${sep}|$)`;
 
@@ -15,6 +12,10 @@ const starPatLast = `(?:${substitution}${endSep})`;
 const starStarPat = `${starPat}*?`;
 const starStarPatLast = `${starPat}*?${starPatLast}?`;
 
+function escapeRegExp(string) {
+  return string.replace(/[|\\{}()[\]^$+*?.]/g, "\\$&");
+}
+
 /**
  * Implement basic pattern matching that will allow users to do the simple
  * tests with * and **. If users want full complex pattern matching, then can