Additional Lambda Handler detection for setting module.exports to an object

**Is your feature request related to a problem? Please describe.**

Extend the javascript Lambda Handler candidate detection from Issue #140 PR #142 to support the following scenarios:

```typescript
const myExports = {
foo: // ...
bar: // ...
}

[module.]exports = myExports

// and

[module.]exports = {
foo: // ...
bar: // ...
}
```

**Describe the solution you'd like**

Where `foo` and `bar` are valid candidates for Lambda function handlers, they are detected with the rest of the candidates.

**Describe alternatives you've considered**

**Additional context**

Review the JavaScript Lambda handler detection work from Issue #140 and PR #142 first. Extend the existing candidate-detection path to cover an object assigned through a variable and an object assigned directly to module.exports or exports. Done when valid foo and bar handlers in both examples are detected with the existing candidates.

Written by the indexing model from the issue text.