Add connection logging to help with debugging #626
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While debugging connection problems it can be helpful to look at the TDS traffic, ideally the unencrypted traffic if encryption is enabled. This patch adds a connection logger that emits the encrypted and unencrypted packets as a hex dump, and also supports the TLS_LOG_KEY_FILE needed for TLS interception in tools like Wireshark.
Split out of #547 where it was first used/relevant.