feature: add antminer mode as str setting.

docs/index.md

@@ -253,6 +253,7 @@ settings.update("default_antminer_password", "my_pwd")
 "factory_get_timeout": 3,
 "get_data_retries": 1,
 "api_function_timeout": 5,
+"antminer_mining_mode_as_str": False,
 "default_whatsminer_password": "admin",
 "default_innosilicon_password": "admin",
 "default_antminer_password": "root",

docs/settings/settings.md

@@ -12,6 +12,7 @@ Settings options:
 - `factory_get_timeout`
 - `get_data_retries`
 - `api_function_timeout`
+- `antminer_mining_mode_as_str`
 - `default_whatsminer_password`
 - `default_innosilicon_password`
 - `default_antminer_password`