feat(modbus_server): add modbus_server io plugins

[iiacoban42]

Summary

This PR introduces input and output plugins designed to interact with a Modbus server. It ensures that both plugins handle various data types to enable producing metrics from incoming requests to Modbus server, as well as writing metrics to Modbus server.

Checklist

• No AI generated code was used in this PR

Related issues

resolves #16667

[srebhan]

@iiacoban42 how is this related to the existing modbus plugin?

[iiacoban42]

The existing modbus acts as a modbus client sending requests wheres modbus_servers implements the server side listening for requests.

In terms of code, modbus_server reuses the same type conversions as the modbus client plugin with a few additions used to convert types to bytes.

[srebhan]

@iiacoban42 I think I first need to better understand the use-cases of those plugins. Let's discuss those in the issue before continuing here...

[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 increases the Telegraf binary size by 2.59 % for linux amd64 (new size: 293.1 MB, nightly size 285.7 MB)

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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