[refactor] rename

[add] `actionWillSelect`

`tabItem(_:label:actionWillSelect:)` accepts a closure performing before the tab is selected.

[fix] Preserve the state of each tab view when switching between tabs

[fix] tab bar in landscape orientation

[update] README.md

[fix] Compile error in Xcode 15.0.0+

[add] BarItemsAlignmentEnvironmentKey

[update] README.md