Add custom script option

[lkrjangid1]

By using following option we can add custom script

customModuleConfig: """
 blotFormatter: {},
 """,
 customQuillRegister: """
  Quill.register('modules/blotFormatter', QuillBlotFormatter.default);
""",
customScriptTag: """
  <script src="https://cdn.jsdelivr.net/npm/quill-blot-formatter@1.0.5/dist/quill-blot-formatter.min.js"></script>
""",