Implement missing interface methods in plugin logger

[mthenw]

hclog interface changed two days ago causing EG build to fail.

Todos:

• Write tests
• Write documentation
• Fix linting errors
• Make sure code coverage hasn't dropped
• Provide verification commands / resources
• Enable "Allow edits from maintainers" for this PR
• Update the messages below

Is this ready for review?: YES
Is it a breaking change?: NO

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@5f94b72). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #482   +/-   ##
=========================================
  Coverage          ?   70.73%           
=========================================
  Files             ?       35           
  Lines             ?     2180           
  Branches          ?        0           
=========================================
  Hits              ?     1542           
  Misses            ?      574           
  Partials          ?       64

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 5f94b72...10a6c1b. Read the comment docs.