IMPALA-9153: Generate CUP parser Java source via CMake

This moves the code generation for the CUP parser from a
Maven plugin to CMake. The Maven plugin is old and always
regenerates the sources even if they haven't changed. This
means that Maven rebuilds many source files on each run,
slowing down the iteration cycle when running frontend
tests.

Fixing the Maven CUP plugin is possible, but it involves
maintaining our own custom Maven plugin for our version
of CUP. The CMake version is less code and almost as good.
Since Maven doesn't generate the files, they never change
and Maven won't rebuild source files on each run. However,
it means that if a developer is actually changing sql-parser.cup,
then Maven won't notice itself. Instead, the developer
needs to run "make java" to regenerate the CUP sources and
rebuild the Java code. This properly specifies the inputs /
outputs, so it will only be regenerated if necessary.

As part of this, it moves the sql-parser.cup from fe/src/main/cup
to common/cup. This is not strictly necessary, but it matches
how Thrift and other code generation is structured.

Testing:
 - Ran local build / local tests
 - Compared generated source for both methods and only the
   timestamps are different

Change-Id: I180b191b72b54e3661726e1560be844341ed92e5
Reviewed-on: http://gerrit.cloudera.org:8080/24598
Reviewed-by: Michael Smith <michael.smith@cloudera.com>
Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>