Create internal httpx client rather than having users pass it in

[Robin5605]

I think it might be a better design choice to have the HTTP client encapsulated within the PyPIServices class, and for it to configure it however it needs. The code itself will also look cleaner:

letsbuilda-pypi/src/letsbuilda/pypi/sync_client.py

Lines 34 to 37 in 8b02f30

	if package_version is not None:
	url = f"https://pypi.org/pypi/{package_title}/{package_version}/json"
	else:
	url = f"https://pypi.org/pypi/{package_title}/json"

The duplicated base URLs can be extracted into the configuration for the HTTP client.

With regard to testing, perhaps you could accept a HTTP client factory method rather than accepting the object directly instead. The default factory would be httpx.Client/httpx.AsyncClient, and tests can pass in a mock that would override it to whatever else.