62599 [flutter_tools] update pubspec .yaml message should not be displayed when creating a new plugin (cla: yes, tool)

62605 [flutter_tools]Set plugin template min flutter sdk version to 1.20 (cla: yes, tool, waiting for tree to go green)

62608 Add daemon handler to start devtools (cla: yes, tool, waiting for tree to go green)

62687 [versions] update to the latest sdk versions (cla: yes, team, tool, waiting for tree to go green)

62697 [flutter_tools] add –analyze-size flag (cla: yes, tool, waiting for tree to go green)

62702 Return devtools serve response instead of printing (cla: yes, tool, waiting for tree to go green)