Calcite SQL Dialect and Flink Table API (SQL) DBAPI Provider

[billyrrr]

This is issue is to add Calcite as a dialect for SQL, and Flink Table API as a DBAPI provider. The aim is to enable relational algebra on query conditions of streams.

The difference in dialect is mainly the following (the following applies to Flink):

• Data Type: STRING, BYTES, RAW, TIME(p) WITHOUT TIME ZONE, TIME(p) WITH LOCAL TIME ZONE, TIMESTAMP(p) WITHOUT TIME ZONE, TIMESTAMP(p) WITH LOCAL TIME ZONE, ARRAY, MULTISET, ROW are not supported
• Query

The difference in feature is mainly the following (the following applies to Flink):

• No pre-fetch
• Only CREATE TABLE stage matters
• Other stream processing features

[billyrrr]

I am implementing a Calcite dialect and FlinkProvider. So far, the examples work very well, and I can push the commit if possible.