fix(inputs.lvm): Allow to specify path to binaries in config file

[dynek]

• Updated associated README.md.
• Wrote appropriate unit tests
• Pull request title or commits are in conventional commit format

Fixes this problem mentioned by @rafaelreis-r to @powersj.

I basically followed what is done in other plugins when it comes to make it possible for user to specify path to binary files.
In this specific situation, I need to be able to modify path for lvs, vgs and lvs as they are located in /sbin/ on my Linux system (Debian Bullseye) rather than /usr/sbin/ like it is currently hard-coded.

[srebhan]

Thanks @dynek for your contribution! Only two small comments from my side. Can you please take a look!?

[telegraf-tiger]

Download PR build artifacts for linux_amd64.tar.gz, darwin_amd64.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

[srebhan]

Looks good to me. Thanks for your contribution @dynek!