feat(inputs.opentelemetry): Add profiles support

[srebhan]

Summary

This PR adds support for (still experimental) OpenTelemetry profiles making Telegraf the world's first collector to support it. ;-)
As a side effect, the unit-tests are extended to allow for general test-cases to be added similar to other plugins.

Tests were performed using the Elastic otel-profiling agent.

Checklist

• No AI generated code was used in this PR

Related issues

[powersj]

Thank you for jumping on this! Let's get this in and get some feedback from users.

[powersj]

This will also need a rebase

[DStrand1]

Looks great! Just one tiny comment

[jacobmarble]

LGTM. Later, you might want to move some of this to https://github.com/influxdata/influxdb-observability but I think this is a good place to try it out.

[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 doesn't significantly change the Telegraf binary size (less than 1%)

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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