Added e2e_test_klime

[beatlevic]

Added e2e test for klime template. Run with:

.venv/bin/python posthog/cdp/templates/klime/e2e_test_klime.py "<write key>" --endpoint http://ingest.klime.dev

Example output of success:

Klime E2E test against http://ingest.klime.dev
Write key: 756660ea...

--- Track event ---
  [OK] http://ingest.klime.dev/v1/batch -> 200
  Response: {
  "status": "ok",
  "accepted": 1,
  "failed": 0
}

--- Identify event (automatic) ---
  [OK] http://ingest.klime.dev/v1/batch -> 200
  Response: {
  "status": "ok",
  "accepted": 1,
  "failed": 0
}

--- Group event (automatic) ---
  [OK] http://ingest.klime.dev/v1/batch -> 200
  Response: {
  "status": "ok",
  "accepted": 1,
  "failed": 0
}

--- Track with all properties (filters $-prefixed) ---
  [OK] http://ingest.klime.dev/v1/batch -> 200
  Response: {
  "status": "ok",
  "accepted": 1,
  "failed": 0
}

--- Identify without userId (should skip) ---
  [hog print] ('No user ID set. Skipping as user ID is required for identify events.',)
  (no HTTP call made — skipped by Hog code)

--- Auth failure (bad write key) ---
  [OK] Error raised: Error('Error from Klime API: 401: {\'error\': \'unauthorized\', \'message\': \'invalid write key\'}')