fix(common.opcua): Support LocalizedText Datatype

[Digitomation]

Summary

This PR adds support for returning OPCUA LocalizedText values via the opc-ua input plugin. Prior to this PR, we silently drop those values. This PR is heavily inspired by https://github.com/influxdata/telegraf/pull/12101

I've converted Localizedtext text parameter to string,

Checklist

• [x] No AI generated code was used in this PR

Related issues

resolves #16194

I'm not proficient in Go, but needed this to work, any help or guidelines to this PR are appreciated!

[telegraf-tiger[bot]]

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.

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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

[mstrandboge]

@Digitomation Thanks for the PR! The code looks good, but are you able to add a test case to cover it? Thanks!

[telegraf-tiger[bot]]

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