Add single asset vault (XLS-65d) (#5224)

- Specification: XRPLF/XRPL-Standards#239
- Amendment: `SingleAssetVault`
- Implements a vault feature used to store a fungible asset (XRP, IOU, or MPT, but not NFT) and to receive shares in the vault (an MPT) in exchange.
- A vault can be private or public.
- A private vault can use permissioned domains, subject to the `PermissionedDomains` amendment.
- Shares can be exchanged back into asset with `VaultWithdraw`.
- Permissions on the asset in the vault are transitively applied on shares in the vault.
- Issuer of the asset in the vault can clawback with `VaultClawback`.
- Extended `MPTokenIssuance` with `DomainID`, used by the permissioned domain on the vault shares.

Co-authored-by: John Freeman <jfreeman08@gmail.com>

src/libxrpl/protocol/STParsedJSON.cpp

@@ -37,6 +37,7 @@
 #include <xrpl/protocol/STCurrency.h>
 #include <xrpl/protocol/STInteger.h>
 #include <xrpl/protocol/STIssue.h>
+#include <xrpl/protocol/STNumber.h>
 #include <xrpl/protocol/STParsedJSON.h>
 #include <xrpl/protocol/STPathSet.h>
 #include <xrpl/protocol/STVector256.h>
@@ -613,6 +614,20 @@ parseLeaf(
 
             break;
 
+        case STI_NUMBER:
+            try
+            {
+                ret =
+                    detail::make_stvar<STNumber>(numberFromJson(field, value));
+            }
+            catch (std::exception const&)
+            {
+                error = invalid_data(json_name, fieldName);
+                return ret;
+            }
+
+            break;
+
         case STI_VECTOR256:
             if (!value.isArrayOrNull())
             {