doc: added a new documentation for event filters

[Chigala]

Description

I've added new content to the documentation that provides a comprehensive guide on Event Triggers, including their usage, and examples.

Changes Made

• Added a detailed explanation of what event filters are and how they work.
• Included an example code snippet illustrating the usage of event triggers
• included examples on how event filters can be used in supabase and stripe triggers
• Proofread and formatted the entire documentation for clarity and consistency.

@ericallam You can take a look and give me your feedback.

closes #294
/claim #294

[changeset-bot]

⚠️ No Changeset found

Latest commit: c390703

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

[ericallam]

Nice work, just a few tweaks needed 👍