Shalon connections should respect ATS configuration

[blochberger]

We use badly documented low-level functions for performing TLS operations required to support Shalon. There we set the default ATS profile:

PrivacyKit/PrivacyKit/Tls.swift

Lines 273 to 278 in 358201c

	/*
	The default session configuration is not a secure one and uses
	TLSv1.0, therefore we should use a more secure configuration, such
	as ATS (App Transport Security).
	*/
	let config = kSSLSessionConfig_ATSv1

Which is better than the default. It should be configurable like the high-level URLSession connections via ATS configuration in the information property list (Info.plist) of the application.