Feature/hydra config modules (#9783)

* hydra: enable config modules

Lets the user specify Hydra configs in installed Python modules as well
as inside directories. Adds `hydra.config_module` to `.dvc/config`.

Fixes #9740

old tests green

tests for config modules

* hydra: fix linter errors

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* hydra: fix mypy error

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* hydra: fix tests

* Update dvc/utils/hydra.py

Co-authored-by: David de la Iglesia Castro <[email protected]>

* address comments

* convince mypy not to worry

* split long line

* fix test

* check for raised error in test

---------

Co-authored-by: Dom Miketa <[email protected]>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: David de la Iglesia Castro <[email protected]>

dvc/repo/experiments/queue/base.py

@@ -476,13 +476,17 @@ class BaseStashQueue(ABC):
         hydra_output_file = ParamsDependency.DEFAULT_PARAMS_FILE
         for path, overrides in params.items():
             if hydra_enabled and path == hydra_output_file:
-                config_dir = os.path.join(
-                    self.repo.root_dir, hydra_config.get("config_dir", "conf")
-                )
+                if (config_module := hydra_config.get("config_module")) is None:
+                    config_dir = os.path.join(
+                        self.repo.root_dir, hydra_config.get("config_dir", "conf")
+                    )
+                else:
+                    config_dir = None
                 config_name = hydra_config.get("config_name", "config")
                 compose_and_dump(
                     path,
                     config_dir,
+                    config_module,
                     config_name,
                     overrides,
                 )