Support Spark SQL Hints

[shangyian]

Summary

This change adds support for parsing Spark SQL hints using the ANTLR parser and our custom SQL AST.

The following changes were made:

1. Replaced the Spark ANTLR grammars with the latest versions:
   • SqlBaseLexer
   • SqlBaseParser
2. Regenerated the ANTLR parser based on the modified grammar with antlr4 -Dlanguage=Python3 -visitor SqlBaseLexer.g4 SqlBaseParser.g4 -o generated.
3. Modified the generated lexer to support hints. There were a few issues with hints previously:
   • The isHint() method was entirely in Java, so I converted it manually to Python.
   • Java has a char type which can be used to compare ascii values of characters with integers, but this comparison needs to be done explicitly in Python with chr(...)
4. Modified the AST to store parsed hint statements by adding a Hint tree node type and a list of hints to SelectExpression.

Test Plan

Added some tests for various Spark hints pulled from https://spark.apache.org/docs/latest/sql-ref-syntax-qry-select-hints.html

• [x] PR has an associated issue: #1026
• [x] make check passes
• [x] make test shows 100% unit test coverage

Deployment Plan

N/A

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