Support omitting the "cell" parameter in the database connection jdbcurl

[wangweicugw]

Description:

Currently, when connecting to a database using a connection URL, the "cell" parameter is required to specify the specific cell within a database cluster. However, in certain scenarios, it would be beneficial to allow the omission of the "cell" parameter.

To enhance the usability and flexibility of the database connection process, it is proposed to modify the system to support connecting to the default cell when the "cell" parameter is omitted from the connection jdbcurl. This means that users can establish a connection without explicitly specifying the cell, relying on the system's default behavior to determine the appropriate cell.