Resolves #8284 /claim #8284

Adds a new Klaviyo piece with the following:

Actions (10):

• Create Profile
• Update Profile
• Subscribe Profile
• Unsubscribe Profile
• Add Profile to List
• Remove Profile from List
• Create List
• Find Profile (by email)
• Find List (by name)
• Find Tag (by name)

Triggers (2):

• New Profile (polling)
• Profile Added to List (polling)

Auth: Secret text (Klaviyo private API key) API version: 2024-10-15 Pattern: Follows the hubspot piece structure with httpClient from @activepieces/pieces-common

Short Video: https://github.com/user-attachments/assets/19012da1-43f6-4a26-a4a7-40d0cee746dc This shows all 10 actions and 2 triggers tested against the live Klaviyo API, all passing.