libs: remove bech32

## Description

bech32 is only used in the sdk. I moved Bech32 to the sdk and we can remove it here. Don't think this needs to go into a minor release

Closes: #XXX

libs/bech32/bech32.go

@@ -1,30 +0,0 @@
-package bech32
-
-import (
-	"fmt"
-
-	"github.com/btcsuite/btcutil/bech32"
-)
-
-//ConvertAndEncode converts from a base64 encoded byte string to base32 encoded byte string and then to bech32
-func ConvertAndEncode(hrp string, data []byte) (string, error) {
-	converted, err := bech32.ConvertBits(data, 8, 5, true)
-	if err != nil {
-		return "", fmt.Errorf("encoding bech32 failed: %w", err)
-	}
-	return bech32.Encode(hrp, converted)
-
-}
-
-//DecodeAndConvert decodes a bech32 encoded string and converts to base64 encoded bytes
-func DecodeAndConvert(bech string) (string, []byte, error) {
-	hrp, data, err := bech32.Decode(bech)
-	if err != nil {
-		return "", nil, fmt.Errorf("decoding bech32 failed: %w", err)
-	}
-	converted, err := bech32.ConvertBits(data, 5, 8, false)
-	if err != nil {
-		return "", nil, fmt.Errorf("decoding bech32 failed: %w", err)
-	}
-	return hrp, converted, nil
-}

libs/bech32/bech32_test.go

@@ -1,31 +0,0 @@
-package bech32_test
-
-import (
-	"bytes"
-	"crypto/sha256"
-	"testing"
-
-	"github.com/tendermint/tendermint/libs/bech32"
-)
-
-func TestEncodeAndDecode(t *testing.T) {
-
-	sum := sha256.Sum256([]byte("hello world\n"))
-
-	bech, err := bech32.ConvertAndEncode("shasum", sum[:])
-
-	if err != nil {
-		t.Error(err)
-	}
-	hrp, data, err := bech32.DecodeAndConvert(bech)
-
-	if err != nil {
-		t.Error(err)
-	}
-	if hrp != "shasum" {
-		t.Error("Invalid hrp")
-	}
-	if !bytes.Equal(data, sum[:]) {
-		t.Error("Invalid decode")
-	}
-}