Refactored ZygoteConnection.Arguments to ZygoteArguments.

This commit moves the ZygoteConnection.Arguments class into its own file
and re-names it to ZygoteArgumens.  Doing this also required small
changes to files that used ZygoteConnection.Arguments.  In turn, this
required some changes to make the files conform to the Frameworks style
guide.

Highlights include:
* Moving ZygoteConnection.Arguments to ZygoteArguments
* Moving helper functions from ZygoteConnection to Zygote
* Re-named member variables in the ZygoteArguments class
* Removed unused imports.

Topic: zygote-prefork
Test: make & flash & launch apps & check log for messages
Bug: 68253328
Change-Id: Ideb414c87a92020128a644147949ef4f4133ae33