fix(inputs.netflow): Ensure type consistency for sFlow's IP version field

[joseluisgonzalezca]

Summary

This PR resolves the inconsistency with ip_version field in netflow metrics when using the sFlow V5 decoder. Version is received as a number (4 or 6), which will be converted to "IPv4" or "IPv6" respectively. Existing decodeSflowIPVersion function was not enough for this case so I have created a new one to handle the conversion.

Checklist

• No AI generated code was used in this PR

Related issues

resolves #16402

[srebhan]

@joseluisgonzalezca thanks for the fix! Could you please add an Important Changes section to the CHANGELOG.md file describing that the field-type changes when decoding raw frames!?

[joseluisgonzalezca]

Sure! I have just submitted a commit with the required information. I've set the version to 1.33.2 because I have seen it in the milestones section. Feel free to reach me again if it's not correct.

[srebhan]

@joseluisgonzalezca I added some suggestion on the Changelog entry. Could you please also check the 80-column limit in that file!?!

[telegraf-tiger]

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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]

Thanks @joseluisgonzalezca!