TableGen standard arithmetic ops

Use tablegen to generate definitions of the standard binary arithmetic
operations.  These operations share a lot of boilerplate that is better off
generated by a tool.

Using tablegen for standard binary arithmetic operations requires the following
modifications.
1. Add a bit field `hasConstantFolder` to the base Op tablegen class; generate
the `constantFold` method signature if the bit is set.  Differentiate between
single-result and zero/multi-result functions that use different signatures.
The implementation of the method remains in C++, similarly to canonicalization
patterns, since it may be large and non-trivial.
2. Define the `AnyType` record of class `Type` since `BinaryOp` currently
provided in op_base.td is supposed to operate on tensors and other tablegen
users may rely on this behavior.

Note that this drops the inline documentation on the operation classes that was
copy-pasted around anyway.  Since we don't generate g3doc from tablegen yet,
keep LangRef.md as it is.  Eventually, the user documentation can move to the
tablegen definition file as well.

PiperOrigin-RevId: 227820815