* fix: copy handler migrated to latest api
* flutter analyze
* code formatted
* fix: test added for copy handler
* more test added for copy handler
* fix:write test for copy handler
* text added for html to nodes
* fix: added more test for html encoder
* fix:removed unused imports
* fix: copyhandler collapse state test added
* added direct event handler in test
* flutter analyze
* revert changes in example.json
* change toolbar and added export so developer can modify according to its need
* revert some chages from examples
* html to document convertion added
* test added
* code formated
* node to html added image parameter
* toolbar color and elevation added in editor stylee
* code formated
* remove duplicated exports
* fix test improts and formating