Add dropdown filter to show rooms, session types.

[lcduong]

This PR closes/references issue #170 . It does so by …

How has this been tested?

Checklist

• I have added tests to cover my changes.

Summary by Sourcery

Add a dropdown filter to show rooms and session types in the schedule, and include session type information in the schedule data model.

New Features:

• Add a dropdown filter to show rooms and session types in the schedule.

Enhancements:

• Include session type information in the schedule data model.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request adds a dropdown filter to show rooms and session types in the schedule model. The changes are implemented by modifying the build_data method in the schedule.py file to include the session type information for each talk.

File-Level Changes

Files	Changes
src/pretalx/schedule/models/schedule.py	Modified the 'build_data' method to include session type information for each talk.

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[sourcery-ai]

Hey @lcduong - I've reviewed your changes - here's some feedback:

Overall Comments:

• Consider adding a test to ensure the new 'session_type' field is correctly populated and returned in the expected format.
• Please check if this change affects any API documentation or contracts that might need updating to reflect the new field.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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[lcduong]

Filter for room, session type and track
no languages filter as there's no language data of session.