dtls: enable DTLS 1.2 Connection IDs

[sam-golioth]

Enable Connection ID support, which enables deviecs to maintain their connection with the server for longer periods and across IP address changes, resulting in lower bandwidth and reduced power usage.

[github-actions[bot]]

Visit the preview URL for this PR (updated for commit 80b48ac):

https://golioth-zephyr-sdk-doxygen-dev--pr446-enable-connectio-gmvsuv1o.web.app

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[sam-golioth]

@sam-golioth will also need to set the socket option here:

https://github.com/golioth/golioth-zephyr-sdk/blob/9455d286ed4c4159f0f1dcbcf5db5e5ef4534dd7/net/golioth/golioth.c#L53

See similar change in CP SDK:

https://github.com/golioth/golioth-firmware-sdk/pull/163/files#diff-410a63a31cf0ae75a5a9bb14ba25e7781fbb87aa7be322035d516647a2b6a11aR218

Fixed! Thanks for the catch!