parse
Parses the xdr field from base64-encoded XDR string to a typed LedgerEntry.LedgerEntryData object.
The LedgerEntryData contains the actual stored data for this entry, with different structures for each entry type (account data, contract data, etc.).
Return
The parsed LedgerEntry.LedgerEntryData XDR object.
Throws
if the XDR string is malformed or cannot be decoded.