connectionProperties支持maxwaitthreadcount

目前这个参数只有单独设置，看是否能够在connectionProperties中支持获取这个参数。

Start by locating the handling of maxWaitThreadCount and the connectionProperties configuration path in the Java code. Check whether existing tests cover retrieving pool settings through connectionProperties; done means maxWaitThreadCount can be obtained through that property path as well as its current separate setting.

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