Fix the Issue When Settings for Externaldata Requests Couldn't Use Clickhouse Settings

Fix the issue when settings for ExternalData requests couldn't use ClickHouse settings. Also, for now, settings date_time_input_format and low_cardinality_allow_in_native_format cannot be used because of the ambiguity of names (in external data it can be interpreted as table format and in the query it can be a setting). #5455 (Danila Kutenin)