fix: openweathermap add feels_like field

[popey]

Required for all PRs:

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

resolves #10695

Added the necessary float data structure to hold the feels_like temperature data.
Updated the test case to include the data during tests.
Ran locally and updated the README.md to include the actual data from the API.

[powersj]

Run make check and make lint-branch localy and resolve those issues and you should be good to go.

[popey]

Thanks for the feedback. All good I think?

alan@robot:~/Source/influxdata/telegraf-issue-10695/telegraf$ make check
go vet $(go list ./... | grep -v ./plugins/parsers/influx)
alan@robot:~/Source/influxdata/telegraf-issue-10695/telegraf$ PATH=$PATH:/usr/local/bin:/home/alan/go/bin make lint-branch
golangci-lint run --new-from-rev master
alan@robot:~/Source/influxdata/telegraf-issue-10695/telegraf$ 

[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_i386.zip
armel.deb	armv6hl.rpm	freebsd_amd64.tar.gz
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
		static_linux_amd64.tar.gz