OTEL_RESOURCE_ATTRIBUTES parsing has whitespace in keys

[inssein]

We run all of our services in Kubernetes, and define our open telemetry resource attributes like so:

            - name: OTEL_RESOURCE_ATTRIBUTES
              value: >
                service.name=redacted,
                service.version=redacted,
                k8s.node.name=$(KUBE_NODE_NAME),
                k8s.pod.name=$(KUBE_POD_NAME),
                k8s.pod.uid=$(KUBE_POD_ID),
                k8s.namespace.name=$(KUBE_NAMESPACE)

All of our other services (java, python) seem to split on "=" and then clean up whitespace in the key, but unfortunately the ruby library sends over service.version=redacted (note the whitespace in front of the key).

Looks like the problem is here: https://github.com/open-telemetry/opentelemetry-ruby/blob/main/sdk/lib/opentelemetry/sdk/resources/resource.rb#L47-L50

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[kaylareopelle]

This is being worked on in #1541

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