papi_hl region-based calculations

[mpatrou]

Pull Request Description

Sibling PR (2/2) split from #525
It updates papi_hl:

• region-based energy counter calculations: delta for energy_consumption above
• region-based energy counter calculations: average between before and after, used in gpu_inst_power
• _internal_hl_read_counters that wasn't reading the counters for all components in the machines we tested.

Author Checklist

• Description
  Why this PR exists. Reference all relevant information, including background, issues, test failures, etc
• Commits
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  Commits have a header of the form: module: short description
  Commits have a body (whenever relevant) containing a detailed description of the addressed problem and its solution
• Tests
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[Treece-Burgess]

As this PR was created from a split of PR #525, an important thread to note is the following.