[Improvement] Reused Isolated class loader as much as possible

### What would you like to be improved?

Currently, if we alter or remove a catalog, we will drop and create a new isolated class loader instance, which may lead to resource leakage. We should try to reuse it as much as possible, in some cases where the configurations change and then the newly created classloader does not match the old one, we will not reuse it.

### How should we improve?

_No response_