[v4] transform typescript (#3702)
* merge v3 to v4
* src/components/IconFont
* src/components/PageLoading
* src/components/SelectLang
* src/components/SettingDrawer
* remove e2e and test
* src/components/TopNavHeader
* src/components/GlobalHeader
* src/components/HeaderDropdown
* src/components/HeaderSearch
* src/components/TopNavHeader
* fix error
* mock
* move defaultSettings
* global.txs
* src/locales
* remove lint mock
* fix ci test error
* change PureComponent to Component, interface IDefaultSettings
* Don't prefix interface with I
Close: #3706
* strictNullChecks set true
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