g/wei math->primitives, some new helpers (#14026)

Co-authored-by: Kasey Kirkham <kasey@users.noreply.github.com>

math/math_helper.go

@@ -3,13 +3,11 @@ package math
 
 import (
 	"errors"
-	"fmt"
 	stdmath "math"
 	"math/big"
 	"math/bits"
 	"sync"
 
-	fssz "github.com/prysmaticlabs/fastssz"
 	"github.com/thomaso-mirodin/intmath/u64"
 )
 
@@ -215,68 +213,6 @@ func AddInt(i ...int) (int, error) {
 	return sum, nil
 }
 
-// Wei is the smallest unit of Ether, represented as a pointer to a bigInt.
-type Wei *big.Int
-
-var _ fssz.HashRoot = (Gwei)(0)
-var _ fssz.Marshaler = (*Gwei)(nil)
-var _ fssz.Unmarshaler = (*Gwei)(nil)
-
-// Gwei is a denomination of 1e9 Wei represented as an uint64.
-type Gwei uint64
-
-// HashTreeRoot --
-func (g Gwei) HashTreeRoot() ([32]byte, error) {
-	return fssz.HashWithDefaultHasher(g)
-}
-
-// HashTreeRootWith --
-func (g Gwei) HashTreeRootWith(hh *fssz.Hasher) error {
-	hh.PutUint64(uint64(g))
-	return nil
-}
-
-// UnmarshalSSZ --
-func (g *Gwei) UnmarshalSSZ(buf []byte) error {
-	if len(buf) != g.SizeSSZ() {
-		return fmt.Errorf("expected buffer of length %d received %d", g.SizeSSZ(), len(buf))
-	}
-	*g = Gwei(fssz.UnmarshallUint64(buf))
-	return nil
-}
-
-// MarshalSSZTo --
-func (g *Gwei) MarshalSSZTo(dst []byte) ([]byte, error) {
-	marshalled, err := g.MarshalSSZ()
-	if err != nil {
-		return nil, err
-	}
-	return append(dst, marshalled...), nil
-}
-
-// MarshalSSZ --
-func (g *Gwei) MarshalSSZ() ([]byte, error) {
-	marshalled := fssz.MarshalUint64([]byte{}, uint64(*g))
-	return marshalled, nil
-}
-
-// SizeSSZ --
-func (g *Gwei) SizeSSZ() int {
-	return 8
-}
-
-// WeiToGwei converts big int wei to uint64 gwei.
-// The input `v` is copied before being modified.
-func WeiToGwei(v Wei) Gwei {
-	if v == nil {
-		return 0
-	}
-	gweiPerEth := big.NewInt(1e9)
-	copied := big.NewInt(0).Set(v)
-	copied.Div(copied, gweiPerEth)
-	return Gwei(copied.Uint64())
-}
-
 // IsValidUint256 given a bigint checks if the value is a valid Uint256
 func IsValidUint256(bi *big.Int) bool {
 	return bi.Cmp(big.NewInt(0)) >= 0 && bi.BitLen() <= 256