opentelemetry-exporter-prometheus: add support to configure Resource attributes as metric labels (#5122)

* add resource attr filter

* update unit tests

* add changelog fragment

* switch from 'resource_attr_filter' to 'resource_attribute_filter'

* fix formatting

* Apply suggestion from @xrmx

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Co-authored-by: Riccardo Magliocchetti <riccardo.magliocchetti@gmail.com>