getAccountDetails returns empty transactions array

Describe the bug getAccountDetails function claims to return transactions but always returns nothing. See https://github.com/near/near-api-js/blob/960b798fe009fe0658637803af9645f550f139cb/src/account.ts#L402

To Reproduce Steps to reproduce the behavior:

1. Create let account = new Account(account_id);
2. Call account.getAccountDetails()
3. Observe the empty transactions in the result

Expected behavior Should remove this field and update comments as it’s confusing

[mehtaphysical]

@frol Oh i mean typescript generic. So instead of https://github.com/near/near-api-js/blob/master/src/providers/json-rpc-provider.ts#L92 it would look like:

async query<T>(...args: any[]): Promise<T> {
...
}

And there would be response types for each of the query request types like:

interface ContractState {
  key: string;
  value: string;
  proof: string;
}

interface ViewStateResult {
  values: ContractState[];
}

Then it could be used like:

const contractState = provider.query<ViewStateResult>({
    request_type: "view_state",
    finality: "final",
    account_id: "guest-book.testnet",
    prefix_base64: ""
})

[frol]

Ah, sure! It was a collision in the terminology 😄

I am all for it. Please, go ahead with a PR, I will be happy to review and merge it!