LedgerRecord is missing successful_transaction_count and failed_transaction_count

[acharb]

Describe the bug
The LedgerRecord interface is missing the two fields:
successful_transaction_count
failed_transaction_count

these two fields are listed in our docs but missing from the js-sdk. They are however in the go-sdk.

What version are you on?
9.1.0

Additional context
Was looking for a type to handle the below code, when I realized the fields are missing

var horizon = new stellarSdk.Server("https://horizon.stellar.org");
        horizon
          .ledgers()
          .cursor(pagingToken)
          .limit(200)
          .stream({
            onmessage: (ledger: ServerApi.LedgerRecord) => {
              ledger.successful_transaction_count // error TS2339: Property 'successful_transaction_count' does not exist on type 'LedgerRecord'.
...