Add GUI test action addon#5

Draft

KazuhiroItoh wants to merge 9 commits intonode-red:mainfrom

node-red-hitachi:dev-gui-test-addon

Commits on Aug 21, 2021

initial prototype of flow testing plugin
HiroyasuNishiyama
committed

Commits on Sep 1, 2021

Commits on Nov 15, 2021

merge initial prototype
HiroyasuNishiyama
committed

Commits on Dec 13, 2021

add action addon with examples & other fixes
HiroyasuNishiyama
committed

Commits on Dec 22, 2021

update addon mechanism & refine sidebar UI
HiroyasuNishiyama
committed

Commits on Mar 18, 2022

add GUI test action addon
KazuhiroItoh
committed

Commits on Mar 29, 2022