refactor: use fasyslog for creating syslog payload

[tisonkun]

This closes #20955.

Somehow self-promoted and I'm actively maintaining fasyslog. I'd appreciate it if you can give a review and see whether we can go in this way.

[bits-bot]

All committers have signed the CLA.

[tisonkun]

cc @jszwedko

[pront]

cc @jszwedko

Hi @tisonkun, we will taking a look at this PR. Thank you for submitting this. There's a big backlog so it takes a bit longer than usual. Generally, for future PRs (and in case someone from the community reads this) please ping @vectordotdev/vector.

[tisonkun]

@pront Thanks for your information!

It seems @vectordotdev/vector is not a team? Since it's not in bold I'm not sure if the notification is sent.

BTW, could you trigger the CI workflow so that I can check if any trivial issues should be fixed?

[pront]

It seems @vectordotdev/vector is not a team? Since it's not in bold I'm not sure if the notification is sent.

Interesting, thanks for letting me know:

BTW, could you trigger the CI workflow so that I can check if any trivial issues should be fixed?

Done!