Frameworks: Add agent to ProfilerInfo

Add an agent option to ProfilerInfo. If set, on bindApplication
attempt to attach the given agent to the app before loading the
app itself.

Bug: 62445317
Test: m
Test: Device boots
Test: Manual profiling tests
Test: cts/hostsidetests/services/activityandwindowmanager/util/run-test CtsServicesHostTestCases android.server.cts.ActivityManagerAmProfileTests
Test: Manual agent test
Test: cts-tradefed run commandAndExit cts-dev --module CtsJvmtiAttachingHostTestCases
Change-Id: I1f0c4121e22351fd3a964dd0a915100a620d4f84