refactor(config): abstract config storage and enable dependency injection

Abstract the configuration storage mechanism to allow using custom
configurations, such as in-memory setups, when using the tool as
a library. This aligns the configuration architecture with the
session cache abstraction.

- Define ConfigInterface protocol and InMemoryConfig class
- Make CacheFile, InMemoryCache, ConfigFile, and InMemoryConfig
  explicitly inherit their interfaces
- Update MdrsService and MdrsClient to accept customizable
  config_class and config instances
- Add validation to check remote parameter consistency in
  create_connection
- Remove unused imports across command files

mdrsclient/services.py

@@ -5,7 +5,7 @@ from unicodedata import normalize
 
 from mdrsclient.api import DoiApi, FilesApi, FoldersApi, LaboratoriesApi, UsersApi
 from mdrsclient.cache import CacheInterface
-from mdrsclient.config import ConfigFile
+from mdrsclient.config import ConfigFile, ConfigInterface
 from mdrsclient.connection import MDRSConnection
 from mdrsclient.exceptions import (
     IllegalArgumentException,
@@ -18,12 +18,21 @@ from mdrsclient.utils import page_num_from_url
 
 
 class MdrsService:
-    def __init__(self, connection: MDRSConnection):
+    config_class: type[ConfigInterface] = ConfigFile
+
+    def __init__(self, connection: MDRSConnection, config_class: type[ConfigInterface] | None = None):
         self.connection = connection
+        if config_class is not None:
+            self.config_class = config_class
 
     @classmethod
-    def create_connection(cls, remote: str, cache: CacheInterface | None = None) -> MDRSConnection:
-        config = ConfigFile(remote)
+    def create_connection(
+        cls, remote: str, cache: CacheInterface | None = None, config: ConfigInterface | None = None
+    ) -> MDRSConnection:
+        if config is None:
+            config = ConfigFile(remote)
+        elif config.remote != remote:
+            raise IllegalArgumentException("Remote host parameter mismatch.")
         if config.url is None:
             raise MissingConfigurationException(f"Remote host `{remote}` is not found.")
         return MDRSConnection(config.remote, config.url, cache=cache)