feat(internal): Add support for parsing a timestamp in a TimeZone

[ErmakovDmitriy]

Summary

This PR adds new options in Time parsing for metrics.
The new options:

• timestamp_tz
• timestamp_tz_ms
• timestamp_tz_us
• timestamp_tz_ns

are similar to corresponding unix timestamp parsing with the only difference is that the timestamp_tz
time is parsed in a Timezone which is set via Timezone-related configuration options.

The motivation is to cover cases when metrics are collected from devices which do not have a concept of Timezone, UNIX time etc but still return time as "number of seconds since UNIX time but in Local timezone".

Please take a look at a discussion in #16875

Checklist

• No AI generated code was used in this PR

Related issues

resolves #16875

[telegraf-tiger]

Thanks so much for the pull request!
🤝 ✒️ Just a reminder that the CLA has not yet been signed, and we'll need it before merging. Please sign the CLA when you get a chance, then post a comment here saying !signed-cla

[ErmakovDmitriy]

!signed-cla

[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