[WIP] Support funnel by hosts

[reynaldichernando]

Addresses #3372

• Add hosts input to funnel report form
• Adjust column query logic to use switch case
• Adjust query to support hostname filtering

The bulk of the change is in the query, in the first level I'm querying all the necessary field which is available for filtering which currently are url_path, event_name, and the newly added hostname.

The join query is done on the first level because we need the hostname value from session table, plus instead of performing more join down the levels, we are simply querying off of previous levels.

[vercel]

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[greptile-apps]

PR Summary

This PR adds hostname filtering capability to the funnel report feature, allowing users to track user journeys across different domains or subdomains.

Key changes:

• Added 'hosts' option in FunnelStepAddForm.tsx dropdown menu for hostname filtering
• Modified getFunnel.ts to include hostname data through session table joins
• Implemented switch case logic to handle different filter types (URL, event, hostname)
• Warning: ClickHouse query implementation needs updates to properly support hostname filtering
• Performance consideration: First-level join strategy may need optimization for large datasets

The implementation provides the requested functionality but requires attention to the ClickHouse query portion and potential performance impacts before being production-ready.

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[greptile-apps]

logic: Self-referential date comparison could cause incorrect funnel tracking. Should compare against the original event's timestamp.