Make change of async payment spendable (#324)

* Drop unused ComputeOutputScript & use ParseTaprootScript internally

* Add pending field to vtxo domain

* Add check to handle async change as claimed vtxo & Move check to prevent spending penidng vtxos to app level

* Rename utils.go to parser.go & Fixes

* Ignore sent-and-reversible vtxos in ListVtxos

* Fixes

Co-authored-by: Louis Singer <louisinger@users.noreply.github.com>

* Fix e2e test

Co-authored-by: Louis Singer <louisinger@users.noreply.github.com>
Co-authored-by: João Bordalo <bordalix@users.noreply.github.com>

* Fix

* Add PendingChange field to vtxo

* Add PendingChange field to Transaction

* Fixes

* Remove logs

---------

Co-authored-by: Louis Singer <louisinger@users.noreply.github.com>
Co-authored-by: João Bordalo <bordalix@users.noreply.github.com>

pkg/client-sdk/client/grpc/client.go

@@ -445,6 +445,7 @@ func (v vtxo) toVtxo() client.Vtxo {
 		RoundTxid:               v.GetPoolTxid(),
 		ExpiresAt:               expiresAt,
 		Pending:                 v.GetPending(),
+		PendingChange:           v.GetPendingChange(),
 		RedeemTx:                redeemTx,
 		UnconditionalForfeitTxs: uncondForfeitTxs,
 		SpentBy:                 v.GetSpentBy(),