feat(inputs.netflow): Add support for sFlow drop notification packets

[srebhan]

Summary

Add support for sFlow packets in format 5 denoting drop notification according to https://sflow.org/sflow_drops.txt.

Checklist

• No AI generated code was used in this PR

Related issues

resolves #15375

[srebhan]

Now that upstream merged the required PRs netsampler/goflow2#328, netsampler/goflow2#336 and netsampler/goflow2#337, we can switch back to original package and define the PR as ready.

[telegraf-tiger]

Download PR build artifacts for linux_amd64.tar.gz, darwin_arm64.tar.gz, and windows_amd64.zip.
Downloads for additional architectures and packages are available below.

☺️ This pull request doesn't significantly change the Telegraf binary size (less than 1%)

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Artifact URLs

DEB	RPM	TAR GZ	ZIP
amd64.deb	aarch64.rpm	darwin_amd64.tar.gz	windows_amd64.zip
arm64.deb	armel.rpm	darwin_arm64.tar.gz	windows_arm64.zip
armel.deb	armv6hl.rpm	freebsd_amd64.tar.gz	windows_i386.zip
armhf.deb	i386.rpm	freebsd_armv7.tar.gz
i386.deb	ppc64le.rpm	freebsd_i386.tar.gz
mips.deb	riscv64.rpm	linux_amd64.tar.gz
mipsel.deb	s390x.rpm	linux_arm64.tar.gz
ppc64el.deb	x86_64.rpm	linux_armel.tar.gz
riscv64.deb		linux_armhf.tar.gz
s390x.deb		linux_i386.tar.gz
		linux_mips.tar.gz
		linux_mipsel.tar.gz
		linux_ppc64le.tar.gz
		linux_riscv64.tar.gz
		linux_s390x.tar.gz

[srebhan]

Marking this as ready due to enable a review as I'm pretty confident this is good due to a test case for the feature. However, I would feel even better if @akarneliuk could give this a final test...