Introducee maxBounds in WindowConfiguration

This value is used to report WM#getMaximumWindowMetrics.
Current approach, which is use logical display metrics,
is not compatible with display area feature.
Especially, when multiple task display area feature
are phasing in.

Test: atest WindowConfigurationTests
Bug: 151414021

Change-Id: Iaa1f52395a1b7a0a7fefd5c31cfde703fa81f509