Telemetry: normalize keys/values saved into JSON

[humitos]

We are currently saving all the keys as-is, without any transformation. This is good for some data, but for some other, like pip packages, this makes the queries to be harder to write and expensive to execute. For example, sphinx_rtd_theme and sphinx-rtd-theme means the same for us and it would be to saved as sphinx-rtd-theme in the JSON data. Also, Sphinx and sphinx and similars.

We can achieve this at

readthedocs.org/readthedocs/telemetry/collectors.py

Lines 39 to 42 in 877c3ba

	# NOTE: we could use `object_hook` to make all the keys lowercase here
	# making easier to filter the results when making queries
	# https://docs.python.org/3/library/json.html#json.load
	return json.loads(content)