Use separate argument in CustomDist for functions that return symbolic representations
          #6462
        
          
      
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The initial API introduced in #6361 of overloading the
randomkwarg and branching depending on whether the function returned PyTensor variables or failed whatsoever was pretty bad. For instance it would mask obvious errors like callingpm.Normal.dist(banana=...).Such errors won't be masked anymore, and the user must instead pass such functions to the
distkwarg. I added a temporary check to help users navigate the API change.It also cleans some stale references to Aesara