Move Java stuff out of base_rules.mk

- Moved the target-only .aidl and .logtag rules to java.mk.
- Moved the .proto rules,  Java library dependency calculation,
  Java resource processing and Java-related
  target-specific and global variables setup to a new java_common.java,
  which is shared by both target and host Java modules.
- Minor cleanup for the moved code.

Bug: 23597357
Change-Id: Ic3eb72e26bb1a663e5739abe0a935f96b88bc352