MPT-12325 Add RQL Query (#7)

MPT-12329 Add RQL Query from SDK Extension 

- Add RQL Query
- Refactored tests
- Applied minor code/style fixes for Ruff, MyPy, and Flake8

https://softwareone.atlassian.net/browse/MPT-12325

Author: albertsola

mpt_api_client/rql/__init__.py

@@ -0,0 +1,3 @@
+from mpt_api_client.rql.query_builder import RQLQuery
+
+__all__ = ["RQLQuery"]  # noqa: WPS410

mpt_api_client/rql/constants.py

@@ -0,0 +1,7 @@
+COMP = ("eq", "ne", "lt", "le", "gt", "ge")
+SEARCH = ("like", "ilike")
+LIST = ("in", "out")
+NULL = "null"
+EMPTY = "empty"
+
+KEYWORDS = (*COMP, *SEARCH, *LIST, NULL, EMPTY)