Add comparison traits to InputWeightPrediction

* Partial Eq is added to Enable symmetric and transitive comparison.
* Eq is added to enable reflexive comparison.

Author: yancyribbens

bitcoin/src/blockdata/transaction.rs

@@ -928,7 +928,7 @@ pub const fn predict_weight_from_slices(
 /// This helper type collects information about an input to be used in [`predict_weight`] function.
 /// It can only be created using the [`new`](InputWeightPrediction::new) function or using other
 /// associated constants/methods.
-#[derive(Copy, Clone, Debug)]
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
 pub struct InputWeightPrediction {
     script_size: usize,
     witness_size: usize,