[mlir][IR] Rename `DenseIntOrFPElementsAttr` to `DenseTypedElementsAttr` (#185687)
`DenseIntOrFPElementsAttr` was recently generalized to accept any type
that implement the `DenseElementType` interface. The name
`DenseIntOrFPElementsAttr` does not make sense anymore. This commit
renames the attribute to `DenseTypedElementsAttr`. An alias is kept for
migration purposes. The alias will be removed after some time.