[New Integration] Snowflake

### Description
Snowflake is a cloud-based data platform that provides a single place for data warehousing, data lakes, data engineering, data science, and more. It was developed in 2012 and launched in 2014 as a Software-as-a-Service (SaaS) solution. Snowflake is designed to run on public clouds, such as Amazon Web Services (AWS), Google Cloud, and Microsoft Azure, and can't be run on-premises.

Reference: https://docs.snowflake.com/en/developer-guide/logging-tracing/logging-tracing-overview

# Integration release checklist

This checklist is intended for integrations maintainers to ensure consistency
when creating or updating a Package, Module or Dataset for an Integration.

### All changes

- [ ] Change follows the [contributing guidelines](https://github.com/elastic/integrations/blob/master/CONTRIBUTING.md)
- [ ] Supported versions of the monitoring target are documented
- [ ] Supported operating systems are documented (if applicable)
- [ ] Integration or [System tests](https://github.com/elastic/elastic-package/blob/master/docs/howto/system_testing.md) exist
- [ ] Documentation exists
- [ ] Fields follow [ECS](https://github.com/elastic/ecs) and [naming conventions](https://www.elastic.co/guide/en/beats/devguide/master/event-conventions.html)
- [ ] At least a manual test with ES / Kibana / Agent has been performed.
- [ ] Required Kibana version set to:

### New Package

- [ ] Screenshot of the "Add Integration" page on Fleet added

### Dashboards changes

- [ ] Dashboards exists
- [ ] Screenshots added or updated
- [ ] Datastream filters added to visualizations

### Log dataset changes

- [ ] [Pipeline tests](https://github.com/elastic/elastic-package/blob/master/docs/howto/pipeline_testing.md) exist (if applicable)
- [ ] Generated output for at least 1 log file exists
- [ ] Sample event (`sample_event.json`) exists