Update CODEOWNERS to include the OSS Tooling Guild (#7472)

* Update CODEOWNERS to include the OSS Tooling Guild

* add a few more files

.github/CODEOWNERS

@@ -13,8 +13,23 @@
 # the core team as a whole will be assigned
 *       @dbt-labs/core
 
-# Changes to GitHub configurations including Actions
-/.github/ @leahwicz
+### OSS Tooling Guild
+
+/.github/                       @dbt-labs/guild-oss-tooling
+.bumpversion.cfg                @dbt-labs/guild-oss-tooling
+
+/.changes/                      @dbt-labs/guild-oss-tooling
+.changie.yaml                   @dbt-labs/guild-oss-tooling
+
+pre-commit-config.yaml          @dbt-labs/guild-oss-tooling
+pytest.ini                      @dbt-labs/guild-oss-tooling
+tox.ini                         @dbt-labs/guild-oss-tooling
+
+pyproject.toml                  @dbt-labs/guild-oss-tooling
+requirements.txt                @dbt-labs/guild-oss-tooling
+dev_requirements.txt            @dbt-labs/guild-oss-tooling
+/core/setup.py                  @dbt-labs/guild-oss-tooling
+/core/MANIFEST.in               @dbt-labs/guild-oss-tooling
 
 ### LANGUAGE
 
@@ -60,6 +75,7 @@
 
 # Postgres plugin
 /plugins/                       @dbt-labs/core-adapters
+/plugins/postgres/setup.py      @dbt-labs/core-adapters @dbt-labs/guild-oss-tooling
 
 # Functional tests for adapter plugins
 /tests/adapter                  @dbt-labs/core-adapters
@@ -71,7 +87,7 @@
 # Perf regression testing framework
 # This excludes the test project files itself since those aren't specific
 # framework changes (excluded by not setting an owner next to it- no owner)
-/performance @nathaniel-may
+/performance                    @nathaniel-may
 /performance/projects
 
 ### ARTIFACTS