What does this PR do?

This PR implements the Klaviyo piece for Activepieces, addressing issue #8284.

Summary of Changes

Actions

• Create or Update Profile - Create new profiles or update existing ones by email
• Track Event - Track custom events for profiles
• Subscribe Profile - Subscribe profiles to email or SMS marketing
• Unsubscribe Profile - Unsubscribe profiles from email or SMS marketing
• Add Profile to List - Add a profile to a specific list
• Remove Profile from List - Remove a profile from a specific list
• Create List - Create a new subscriber list
• Find Profile - Search for profiles by email or phone number
• Find List by Name - Search for lists by name
• Find Tag by Name - Search for tags by name
• Custom API Call - Make custom API calls to any Klaviyo endpoint

Triggers

• New Profile - Triggers when a new profile is created
• New Event - Triggers when a new event is tracked
• Profile Added to List - Triggers when a profile is added to a specific list

Authentication

• API Key authentication with validation
• Uses Klaviyo API revision 2024-10-15

Testing

• Build passes successfully
• Lint passes with only minor warnings (no errors)
• All TypeScript compilation errors resolved

Related Issue

Fixes #8284

Bounty Claim

/claim #8284