feat: support warehouse-level settings

[BohuTANG]

Summary

Query:

In a write warehouse(cluster_id: w1), we can set:

set warehouse max_threads = 4;

In a query warehouse(cluster_id: w2), we can set:

set warehouse max_threads = 8;

Important Note: These settings adjustments cannot be performed on the management node directly. Instead, the warehouse cluster ID must be retrieved from the configuration prior to executing the set operation.

Metasrv:

The warehouse-level setting key format:

__fd_settings_warehouse/<tenant>/<warehouse>/max_threads

So the warehouse-level in metasrv:

__fd_settings_warehouse/mytenant/w1/max_threads, 4
__fd_settings_warehouse/mytenant/w2/max_threads, 8

For executing a query, the process involves first listing the global level settings. Subsequently, it lists the warehouse level settings, which serve to override the global settings as necessary.