logging: frontends: stmesp: alternate message output option

[ahjus]

Add an alternate message output option in which messages are ended with an additional zero data byte with marker and timestamp. Can be used to maintain compatibility with certain decoders.

[github-actions]

Hello @ahjus, and thank you very much for your first pull request to the Zephyr project!
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[nordic-krch]

n is the implicit default so this line can be removed.

[ahjus]

@nordic-krch Line removed.

[github-actions]

Hi @ahjus!
Congratulations on getting your very first Zephyr pull request merged 🎉🥳. This is a fantastic achievement, and we're thrilled to have you as part of our community!

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Thank you for your valuable input, and we look forward to seeing more of your contributions in the future! 🪁