Adding @dhermes to CODEOWNERS.

[dhermes]

PR Summary

Also updating CODEOWNERS syntax to use * and putting GitHub handles in alphabetical order.

• Type: Internal
• Intended Change Level: patch

Reviewers:

Reviewers keep the following in mind while reviewing this PR, and provide an assessment of them in your approval comment:

• Does the "Intended Change Level" above match the actual behavior of this PR?
• Is this PR following patterns set forth in the package (if modifying a package), or the go-sdk design patterns if implementing a new package from scratch?
• Does this require a backport to LTS versions? If so ping, let the contributors group know.

[codecov]

Codecov Report

Merging #227 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #227   +/-   ##
=======================================
  Coverage   67.54%   67.54%           
=======================================
  Files         563      563           
  Lines       30438    30438           
=======================================
  Hits        20559    20559           
  Misses       8603     8603           
  Partials     1276     1276           

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