Import/export false positive between namespace and variable

```ts
export namespace testType { ... }

export const testType = { ... }
```

Results in: `error Multiple exports of name 'testType' import/export`

Here is an example: https://github.com/unional/type-plus/blob/main/type-plus/ts/testing/test_type.ts

Start by reproducing the `import/export` report with the TypeScript example in `type-plus/ts/testing/test_type.ts`. Then inspect the rule's handling of namespace and variable exports and find its related tests. Done means the valid namespace-and-variable case no longer produces the false-positive error while duplicate exports remain reported.

Written by the indexing model from the issue text.