flowtype/require-types-at-top is thrown when mixing type/ declaration

```js
declare function DataPoolConnectMethodType (): Promise;
declare function DataPoolConnectMethodType ((connection: DatabaseIsolatedPoolConnectionType) => Promise): Promise;

type FooType = string;

```

Expected:

No warnings.

Actual:

Getting "flowtype/require-types-at-top" error.

Start at the flowtype/require-types-at-top rule entry point and reproduce the reported JavaScript snippet. Check why the type declaration after the declare functions is reported, then verify that the example produces no warnings.

Written by the indexing model from the issue text.