remove: remove react-codemirror2 packages. (rjsf-team#2359)

Author: galanggg

packages/core/package-lock.json

@@ -90,7 +90,6 @@
  "nyc": "^13.2.0",
  "prettier": "^1.15.1",
  "react": "^16.9.0",
- "react-codemirror2": "^4.1.0",
  "react-dom": "^16.9.0",
  "react-monaco-editor": "^0.26.2",
  "react-portal": "^4.2.0",

packages/core/package.json

@@ -102,7 +102,6 @@
  "nyc": "^15.1.0",
  "prettier": "^1.15.1",
  "react": "^16.9.0",
- "react-codemirror2": "^4.1.0",
  "react-dom": "^16.9.0",
  "react-monaco-editor": "^0.26.2",
  "react-portal": "^4.2.0",

packages/playground/package-lock.json

@@ -74,7 +74,6 @@
  "prettier": "^1.15.1",
  "prop-types": "^15.7.2",
  "react": "^16.8.6",
- "react-codemirror2": "^4.1.0",
  "react-dom": "^16.8.6",
  "react-monaco-editor": "^0.26.2",
  "react-portal": "^4.2.0",