[SCSB-229] explicitly define code owners for steps and packages (#2094)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: zacharyburnett

.github/CODEOWNERS

@@ -1,11 +1,36 @@
 # automatically requests pull request reviews for files matching the given pattern; the last match takes precendence
+# https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/about-code-owners
+#
+# pull requests are required to have at least 1 approval from one of the codeowners, as defined in the ruleset at https://github.com/spacetelescope/romancal/settings/rules/7658093
+# files defined without any usernames or teams will have NO codeowner
 
-# maintainers own everything
-* @spacetelescope/romancal-maintainers
+# any files not matched below default to the maintainers team
+* 								@spacetelescope/romancal-maintainers
 
-# developers can own some specific paths
-/.github/ @spacetelescope/romancal-developers  # CI files
-/* @spacetelescope/romancal-developers  # top level files only
-/changes/** @spacetelescope/romancal-developers  # changelogs
-/docs/** @spacetelescope/romancal-developers  # docs
-/romancal/regtest/** @spacetelescope/romancal-developers  # regtest code
+# workflows and automation
+/.github/						@zacharyburnett @jhunkeler
+
+# steps and packages
+/romancal/assign_wcs/			@spacetelescope/romancal-maintainers @ddavis-stsci
+/romancal/associations/			@spacetelescope/romancal-maintainers @ddavis-stsci @mairanteodoro
+/romancal/dark_current/			@spacetelescope/romancal-maintainers @ddavis-stsci
+/romancal/datamodels/			@spacetelescope/romancal-maintainers @PaulHuwe
+/romancal/dq_init/				@spacetelescope/romancal-maintainers @ddavis-stsci
+/romancal/flatfield/			@spacetelescope/romancal-maintainers @ddavis-stsci
+/romancal/flux/					@spacetelescope/romancal-maintainers @stscieisenhamer
+/romancal/jump/					@spacetelescope/romancal-maintainers @WilliamJamieson
+/romancal/lib/					@spacetelescope/romancal-maintainers @ddavis-stsci
+/romancal/linearity/			@spacetelescope/romancal-maintainers @ddavis-stsci
+/romancal/multiband_catalog/	@spacetelescope/romancal-maintainers @larrybradley @mairanteodoro @stscieisenhamer
+/romancal/orientation/			@spacetelescope/romancal-maintainers @stscieisenhamer
+/romancal/outlier_detection/	@spacetelescope/romancal-maintainers @mairanteodoro
+/romancal/photom/				@spacetelescope/romancal-maintainers @ddavis-stsci
+/romancal/pipeline/				@spacetelescope/romancal-maintainers @ddavis-stsci
+/romancal/ramp_fitting/			@spacetelescope/romancal-maintainers @WilliamJamieson @stscieisenhamer
+/romancal/refpix/				@spacetelescope/romancal-maintainers @WilliamJamieson
+/romancal/resample/				@spacetelescope/romancal-maintainers @mairanteodoro
+/romancal/saturation/			@spacetelescope/romancal-maintainers @ddavis-stsci
+/romancal/skymatch/				@spacetelescope/romancal-maintainers @mairanteodoro
+/romancal/source_catalog/		@spacetelescope/romancal-maintainers @larrybradley @mairanteodoro @stscieisenhamer
+/romancal/stpipe/				@spacetelescope/romancal-maintainers @ddavis-stsci
+/romancal/tweakreg/				@spacetelescope/romancal-maintainers @mairanteodoro