Cloud: Support for Hasura migrations with snowflake connector

### Is your proposal related to a problem?

Currently, while performing any migration operation via CLI command against snowflake database, it results into following error

```
FATA[0008] migrations on database 'snowflake' of kind 'snowflake' is not supported.
```

### Describe the solution you'd like

At the moment of creating this GH ticket, the snowflake connector is still in "beta". As it progresses and moves out of beta stage, it would be good to have Hasura migrations support on snowflake.

Start with the CLI migration operation that emits the unsupported-database error and trace how the Snowflake connector is handled. Review the existing migration support for other databases. Done means migration commands work against Snowflake without the reported unsupported error, with the relevant behavior covered by tests if the project provides them.

Written by the indexing model from the issue text.