feat(inputs.modbus): Allow grouping across register types

[srebhan]

Summary

Currently, each output of a request has the register-type added as a tag, this prevents grouping across register types. However such a grouping across register types might be helpful especially for the metric configuration-style.

This PR adds a exclude_register_type_tag option which is false by default to keep the current behavior. However, for the request and metric configuration-style this allows to group request outputs across register-types by setting it to true.

Checklist

• No AI generated code was used in this PR

Related issues

resolves #16031

[telegraf-tiger]

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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