Provide default implementation for some methods in BcSmartspaceDataPlugin.java.

Many methods are only useful for BcSmartspaceView (At-A-Glance).

Most of the default methods now throw a "Not implemented" exception.
However, kept `setKeyguardBypassEnabled` as a no-op, so that it can be
called in a loop over SmartspaceView's.

Bug: 261752855
Test: manual
Change-Id: I8f250a6d2c5a8e84f78183b4563caa56ed79f77f