Snowflake alternative hostname implementation

[BenSatori]

Is your feature request related to a problem? Please describe.
Snowflake supports using an alternative hostname (e.g. not .snowflakecomputing.com). Without setting it, in environments such as with privatelink or custom hostnames (such as proxied), it's not possible to configure Snowflake.

Describe the solution you'd like
Adding an advanced settings field of "alternative hostname", which if present will override the existing hostname (.snowflakecomputing.com). Note that the account itself needs to be sent with the "account" JDBC parameter.

How important is this feature to you?
For us this is specifically important, as we proxy traffic to Snowflake accounts.

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[likeshumidity]

Metabase users are unable to connect to Snowflake via PrivateLink until this is resolved.