[mlir][ods] Optimize FoldAdaptor constructor (#93219)

FoldAdaptor is generated as a subclass of the operation's generic
adaptor, which requires an OperationName instance. It called into the
generic base constructor that constructed the OperationName from a
string, requiring a StringMap lookup inside the MLIRContext.

This makes constructing FoldAdaptors really slow, which is a shame
because the `Operation *` is right there. This PR changes GenericAdaptor
constructor from an operation to grab the OperationName directly from
the `Operation *`. In addition, it generates the constructor inline if
the operation doesn't have properties, since otherwise it requires the
definition of the op.