main/chrony: add support for NTS

Closed Sören Tempel requested to merge nmeum/aports:chrony-nts into master

NTS is an authentication mechanism for NTP defined in RFC 8915. It allows preventing man-in-the-middle attacks on the NTP protocol. While this changes adds support for NTS, it is not enable by default as relatively few servers currently support NTS. We might enable it by default separately in the future.

Fixes #12442 (closed)

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