Make provision to add destination_muxed_id in the output for the oper… (#5715)

* Make provision to add destination_muxed_id in the output for the operations endpoint.

This is partial work.
As in, this commit helps to ensure that downstream cli can be made aware of it.
The actual work to ensure that destination_muxed_id is parsed from StellarAssetContract and stored in DB as a part of parsing details will be done separately

* update changelog for horizon

* address code review comments

Author: karthikiyer56

protocols/horizon/operations/main.go

@@ -401,12 +401,15 @@ type RestoreFootprint struct {
 //
 // Amount - expressed as a signed decimal to 7 digits precision.
 // Asset  - the classic asset expressed as issuer and code.
+// DestinationMuxedId - If the event's destination was a muxed address, then include the that in the response as a string
 type AssetContractBalanceChange struct {
 	base.Asset
-	Type   string `json:"type"`
-	From   string `json:"from,omitempty"`
-	To     string `json:"to,omitempty"`
-	Amount string `json:"amount"`
+	Type                   string `json:"type"`
+	From                   string `json:"from,omitempty"`
+	To                     string `json:"to,omitempty"`
+	Amount                 string `json:"amount"`
+	DestinationMuxedIdType string `json:"destination_muxed_id_type,omitempty"`
+	DestinationMuxedId     string `json:"destination_muxed_id,omitempty"`
 }
 
 // Operation interface contains methods implemented by the operation types

services/horizon/CHANGELOG.md

@@ -12,6 +12,7 @@ In Protocol 23, Stellar Core removes in-memory mode and requires on-disk mode (u
 
 ### Added
 - Update default pubnet captive core configuration to replace Whalestack with Creit Technologies in the quorum set ([5564](https://github.com/stellar/go/pull/5564)).
+- Added 2 new optional string fields - `destination_muxed_id_type` and `destination_muxed_id`, in the `asset_balance_changes` section of the `/operations` endpoint. If operation is `InvokeHostFunction` and if the destination is a muxed address, then the `destination_muxed_id_type` represents the type of the muxed id -  `uint64`,`string` or `bytes`, and `destination_muxed_id` contains the value (hex encoded string, if the type is bytes )
 
 ## 22.0.3