feat: servicenow incident activity sync

[zekebawt]

Summary

This PR adds incident activity synchronization capabilities to the ServiceNow provider.

Closes #3379

Changes

• _get_incident_activities(): Fetches work notes and comments from ServiceNow incidents via the sys_journal_field table
• _add_incident_activity(): Pushes activities (work notes/comments) to ServiceNow incidents
• sync_incident_activities(): Bidirectional sync between ServiceNow and Keep

Usage

# Get activities from ServiceNow
activities = provider._get_incident_activities(incident_id="INC0010001")

# Add activity to ServiceNow
provider._add_incident_activity(
    incident_id="INC0010001",
    content="Investigating issue...",
    activity_type="work_notes"
)

# Bidirectional sync
sn_activities, synced = provider.sync_incident_activities(
    incident_id="INC0010001",
    keep_activities=[{"content": "Update from Keep", "type": "work_notes"}]
)

Testing

• Tested with ServiceNow REST API
• Supports both basic auth and OAuth
• Handles pagination for large activity lists

/claim #3379

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[zekebawt]

ServiceNow activity sync PR is ready! Implements incident work notes/comments sync as requested in #3379.

Features:

• Fetch activities from ServiceNow ()
• Push activities to ServiceNow ()
• Bidirectional sync ()

Ready for review! 🚀