refactor: replace min/max helpers with built-in min/max

We can use the built-in `min` and `max` functions since Go 1.21.

Reference: https://go.dev/ref/spec#Min_and_max
Signed-off-by: Eng Zer Jun <engzerjun@gmail.com>

lntypes/comparison.go

@@ -1,26 +0,0 @@
-package lntypes
-
-import "golang.org/x/exp/constraints"
-
-// Number defines a type constraint for numbers.
-type Number interface {
-	constraints.Integer | constraints.Float
-}
-
-// Max returns the greater of the two inputs.
-func Max[N Number](op1 N, op2 N) N {
-	if op1 > op2 {
-		return op1
-	}
-
-	return op2
-}
-
-// Min returns the lesser of the two inputs.
-func Min[N Number](op1 N, op2 N) N {
-	if op1 < op2 {
-		return op1
-	}
-
-	return op2
-}

lntypes/comparison_test.go

@@ -1,25 +0,0 @@
-package lntypes
-
-import (
-	"testing"
-
-	"github.com/stretchr/testify/require"
-)
-
-// TestMin tests getting correct minimal numbers.
-func TestMin(t *testing.T) {
-	t.Parallel()
-
-	require.Equal(t, 1, Min(1, 1))
-	require.Equal(t, 1, Min(1, 2))
-	require.Equal(t, 1.5, Min(1.5, 2.5))
-}
-
-// TestMax tests getting correct maximal numbers.
-func TestMax(t *testing.T) {
-	t.Parallel()
-
-	require.Equal(t, 1, Max(1, 1))
-	require.Equal(t, 2, Max(1, 2))
-	require.Equal(t, 2.5, Max(1.5, 2.5))
-}