Serialize all standard actions as bit mask

As described in the attached bug, all(not just legacy) AccessibilityNodeInfo
standard actions can be serialized into a bit mask. This implements that.

Fixes: 33949542
Test: cts-tradefed run singleCommand cts -d --module CtsAccessibilityServiceTestCases
cts-tradefed run singleCommand cts -d --module CtsAccessibilityTestCases
cts-tradefed run singleCommand cts -d --module CtsUiAutomationTestCases
Change-Id: I0619ee33de3051d582420d4aef135205a9ec7e8c