[AUR-401] Disable Haystack telemetry with monkey patching (#1)

Sample Haystack log when running a pipeline. Note: the `pipeline.classname` can leak company information.

```json
{
  "hardware.cpus": 16,
  "hardware.gpus": 0,
  "libraries.colab": false,
  "libraries.cuda": false,
  "libraries.haystack": "1.20.0rc0",
  "libraries.ipython": false,
  "libraries.pytest": false,
  "libraries.ray": false,
  "libraries.torch": false,
  "libraries.transformers": "4.31.0",
  "os.containerized": false,
  "os.family": "Linux",
  "os.machine": "x86_64",
  "os.version": "6.2.0-26-generic",
  "pipeline.classname": "TempPipeline",
  "pipeline.config_hash": "07a8eddd5a6e512c0d898c6d9f445ed9",
  "pipeline.nodes.PromptNode": 1,
  "pipeline.nodes.Shaper": 1,
  "pipeline.nodes.WebRetriever": 1,
  "pipeline.run_parameters.debug": false,
  "pipeline.run_parameters.documents": [
    0
  ],
  "pipeline.run_parameters.file_paths": 0,
  "pipeline.run_parameters.labels": 0,
  "pipeline.run_parameters.meta": 1,
  "pipeline.run_parameters.params": false,
  "pipeline.run_parameters.queries": true,
  "pipeline.runs": 1,
  "pipeline.type": "Query",
  "python.version": "3.10.12"
}
```

Solution: Haystack telemetry uses the `telemetry` variable, `posthog` library and `HAYSTACK_TELEMETRY_ENABLED` envar. We set the envar to False and make sure the relevant objects are disabled.

knowledgehub/__init__.py

@@ -0,0 +1,25 @@
+# Disable telemetry with monkey patching
+import logging
+
+logger = logging.getLogger(__name__)
+try:
+    import posthog
+
+    def capture(*args, **kwargs):
+        logger.info("posthog.capture called with args: %s, kwargs: %s", args, kwargs)
+
+    posthog.capture = capture
+except ImportError:
+    pass
+
+try:
+    import os
+
+    os.environ["HAYSTACK_TELEMETRY_ENABLED"] = "False"
+    import haystack.telemetry
+
+    haystack.telemetry.telemetry = None
+except ImportError:
+    pass
+
+__version__ = "0.0.1"