[destination] implement loader for Snowflake with PUT stage

[rudolfix]

Background
Implement Snowflake destination based on PUT stage. It will be quite similar to the BigQuery implementation (just simpler).

Tasks

• use jsonl as preferred type
• use PUT to stage
• allow option to remove files when COPY INTO succeeded.
• our jsonl uses base64 to store binary so enable BINARY_FORMAT in COPY INTO https://docs.snowflake.com/en/sql-reference/sql/copy-into-table
• fail on any error on COPY INTO, return up to 100 errors
• i think you must use TRUNCATE for replace load, do TRUNCATE COPY in one transaction!
• implement cluster hint with CLUSTER BY

Authentication
Derived from ConnectionStringCredentials:

1. • must understand sql alchemy syntax https://docs.snowflake.com/en/developer-guide/python-connector/sqlalchemy
2. • should expose several query parameters as fields warehouse role
3. • key pair auth should be supported https://docs.snowflake.com/en/developer-guide/python-connector/sqlalchemy#key-pair-authentication-support

Tests

1. • we should enable it as destination in tests. all tests using ALL_DESTINATIONS must pass
2. • it should pass the same common tests which BigQuery job client and sql client is passing
3. • note that to pass sql_client tests you'll need to map DBApi exceptions into 3 categories that dlt needs: relation not found, terminal exceptions, transient exceptions. see bigquery and postgres implementations. that's manual work

all in all writing the test suite is more work than the code here

[rudolfix]

@adrianbr if you have any comments to the ticket...