Add ActivityStartOptions data class for starting activities from sysui

Allows different options to be passed into the internal ActivityStarter
implementation without adding another overloaded method call. Needed to
fix starting activities from the clipboard UI in secondary user/hsum.

Test: manual
Bug: 217922018
Flag: EXEMPT no behavior change

Change-Id: Id25ae91095535d6de58c8dfa1a4856044e256b91