`timeZone` causes bad performance due to slow re-renders

[mciudoiu]

Using timeZone significantly affects performance slowing down re-renders by up to 15x.
Having some disabled dates and modifiers additionally increases this time.

To reproduce

CodeSandbox: https://codesandbox.io/p/sandbox/daypicker-bug-report-forked-8lrc7t

Actual Behavior

Re-renders are very slow.

Expected Behavior

Be as fast as when not using timeZone.

[rodgobbi]

@mciudoiu Thanks for the detailed CodeSandbox!

I'll investigate it and try to improve it.