move parsing params to utils (#5259)

* move parsing params to utils

* fix tests

* move chunk_dict and test it

* update test

tests/unit/utils/test_cli_parse.py

@@ -0,0 +1,20 @@
+from dvc.utils.cli_parse import parse_params_from_cli
+
+
+def test_parse_params():
+    assert parse_params_from_cli(
+        [
+            "param1",
+            "file1:param1,param2",
+            "file2:param2",
+            "file1:param3,param4,",
+            "param2,param10",
+            "param3,",
+            "file3:",
+        ]
+    ) == {
+        "params.yaml": ["param1", "param2", "param10", "param3"],
+        "file1": ["param1", "param2", "param3", "param4"],
+        "file2": ["param2"],
+        "file3": [],
+    }