Add c_bindings version of RefundBuilder

Add c_bindings version of RefundBuilder

Use the macros introduced in the previous commit to define a builder
called RefundMaybeWithDerivedMetadataBuilder.

The difference between this and RefundBuilder is that this has methods
that take `self` by mutable reference instead of by value and don't
return anything instead returning the modified builder. This is required
because bindings don't support move semantics. Because of this, the
builder's contents must be cloned when building a Refund.

Keeps RefundBuilder defined so that it can be used internally in
ChannelManager::create_refund_builder even when compiled for c_bindings.