DRILL-6634: Add udf module under contrib directory and move some udfs into it
1. Created new contrib/udf module.
2. Moved distance, phonetic, networking, crypto functions from java-exec to contrib/udf module.
3. Moved functions from gis module to contrib/udf module. Removed gis module.
4. Removed unnecessary dependencies from java-exec module.
5. Minor refactoring of moved functions code.
closes #1403
