Add SnowflakeOperatorAsync Extractor Support

[denimalpaca]

Problem

Snowflake Extractor does not support Astronomer-provided Async Operator.

Closes: #860

Solution

Adds SnowflakeOperatorAsync to the SnowflakeExtractor operator classname list.

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[denimalpaca]

@collado-mike @rossturk @mobuchowski this would be a really good, easy one for us to add so we can start getting more lineage on Astro provider operators!

[collado-mike]

Looks good - just a minor tweak to the unit tests is needed to merge this.

[denimalpaca]

@collado-mike I don't follow what needs to be changed in the unit tests. Like just adding a test checking that the get operators returns both items in the list?

@rossturk confirmed that the extractor does work on the async operator, it's showing up in the datakin UI, but the queries from the async operator aren't getting parsed it seems, because the queries aren't showing up and the connections between the operators aren't showing up.

[collado-mike]

Unit tests results here: https://app.circleci.com/pipelines/github/OpenLineage/OpenLineage/3757/workflows/e03b558f-19ec-4b16-b243-da60fbe168ce/jobs/39027