Remove UDF declarations from queries

[jklukas]

Follow-up to #141

• Extend the code in tests/parse_udfs.py to also read through the files under sql/ and identify usage of udfs there
• Write a python script to use the above udf dependency resolution logic, writing out generated sql files to a new directory (perhaps we call this target/sql to match Maven's conventions); each file would contain the body of all temporary UDFs needed in the query, and then the query text itself
• Remove UDF declarations from the source files under sql/ and update the logic for our CircleCI deploy job to make sure that the published container has a sql/ directory that contains the generated queries with UDF definitions

[jklukas]

This would supersede #148

[scholtzan]

I'll work on this.