Support for new JDBC connector Snowflake

[dmariamgeorge]

Description

Snowflake database is a cloud-hosted relational database that is used to build data warehouses and combines the functions of traditional databases with new capabilities. This PR implements support for the Snowflake connector in Presto by introducing a new module presto-snowflake.

Motivation and Context

Adding support to the Snowflake connector allows querying and creating tables in an external Snowflake database through Presto. This can be used to join data between different systems like Snowflake and Hive, or between two different Snowflake accounts.

Impact

Introduces a new module presto-snowflake. Allows users to connect to external Snowflake database and query through Presto. Following statements that are checked are supported by the Snowflake connector in Presto:

Addresses the issue #21843.

Test Plan

Configured the Snowflake connector, by creating a catalog properties file in etc/catalog named snowflake.properties, to mount the Snowflake connector as the snowflake catalog. Tested the following SQL statements:
queries.txt

Contributor checklist

• Please make sure your submission complies with our development, formatting, commit message, and attribution guidelines.
• PR description addresses the issue accurately and concisely. If the change is non-trivial, a GitHub Issue is referenced.
• Documented new properties (with its default value), SQL syntax, functions, or other functionality.
• If release notes are required, they follow the release notes guidelines.
• Adequate tests were added if applicable.
• CI passed.

Release Notes

== RELEASE NOTES ==

General Changes

* Add new Presto connector for Snowflake.

[steveburnett]

As this draft develops, please add documentation by adding a new file about this connector to https://github.com/prestodb/presto/tree/master/presto-docs/src/main/sphinx/connector.

[github-actions]

Codenotify: Notifying subscribers in CODENOTIFY files for diff d4bdf97...1547465.

Notify	File(s)
@steveburnett	presto-docs/src/main/sphinx/connector.rst presto-docs/src/main/sphinx/connector/snowflake.rst

[steveburnett]

Thanks for the documentation! I made a few suggestions for clarity and style, and tried to explain my reasoning. Let me know if you have any concerns about my suggestions and we'll figure out answers together.

[steveburnett]

Is there a standard set of abbreviations for measurements of time in this context? This reads to me as both milliseconds and minutes are acceptable values. I searched but didn't find anything quickly.

[dmariamgeorge]

@steveburnett - Both units milliseconds and minutes are supported.

[steveburnett]

To add the new documentation page to the Connectors index page in the documentation, in addition to creating the new .rst page in the /connector directory, you must also edit the connectors index page

https://github.com/prestodb/presto/blob/master/presto-docs/src/main/sphinx/connector.rst

[steveburnett]

LGTM! (docs)
Pulled updated branch, new local build of docs. Everything looks good, thanks!

The Snowflake Connector link appears on the Connectors index page in the local build.

[skairali]

This is an important connect for Presto as this will give us ability handle snowflake usecases

[skairali]

A need of the hour connector for presto, huge value for community

[skairali]

@dmariamgeorge We need following before it to get merged

1. Compre hensive UT
2. Integration tests ( if possible with mocks)