SSDM-12451 : Navigation - introduce DATABASE tab with a new browser

openbis_ng_ui/src/js/common/consts/pages.js

openbis_ng_ui/src/js/common/consts/routes.js

openbis_ng_ui/src/js/components/App.jsx

openbis_ng_ui/src/js/components/common/browser2/Browser.jsx

...ui/src/js/components/common/browser2/BrowserController.js

...s_ng_ui/src/js/components/common/browser2/BrowserNode.jsx

..._ng_ui/src/js/components/common/browser2/BrowserNodes.jsx

openbis_ng_ui/src/js/components/common/menu/Menu.jsx

openbis_ng_ui/src/js/components/database/Database.jsx

...ui/src/js/components/database/browser/DatabaseBrowser.jsx

.../components/database/browser/DatabaseBrowserController.js