feat(api/v2): ⭐ Implement webhooks/events

[Nudelsuppe42]

[1] Feature Description
As API version 1, version 2 should also have webhook support for BuildTeams to get updated when information on their team changes. The following format is used by version 1 and should be continued:

{
    "type": {key},
    "timestamp": "2025-07-12T12:41:27.871Z",
    "data": [...]
}

These API events should be added and sent to connected webhooks:

• APPLICATION_SUBMIT
• APPLICATION_UPDATE
• CLAIM_CREATE
• CLAIM_UPDATE
• CLAIM_DELETE
• MEMBER_ADD
• MEMBER_REMOVE