[api-extractor] Add support for export namespace syntax

[nirshar]

Summary

Fixes #2780
Add support for export namespace syntax.
export * as ___ from ___

Details

export namespace syntax is a shortened for
import * as ns from './file'
export { ns }

api-extractor supports import namespace syntax.
This fix enhances existing code and implements the export namespace syntax.

I've created a new class AstNamespaceExport that extends the AstNamespaceImport as namespace-export is an exported namespace-import

I updated the shouldInlineExport method of the CollectorEntity to return true for AstNamespaceExport instances.
this way when the DtsRollupGenerator renders all the AstNamespaceImport entities (by creating a namespace declaration),
for the AstNamespaceExport entities it will also add an inline export keyword
(because the AstNamespaceExport is an exported AstNamespaceExport)

in the ExportAnalyzer, whenever we have export * as ___ declaration
I first create an AstNamespaceImport entity and add it to the astNamespaceImportByModule to avoid circular imports, then return an AstNamespaceExport entity based on that.

Alternatively, I could avoid extending the AstNamespaceImport and create the AstNamespaceExport class that extends AstSyntheticEntity.
This way dealing with those exports in the dtsRollupGenerator cannot just use the current AstNamespaceImport and the shouldInlineExport and I had to do it more concisely.
However, the export uses the same attributes of the AstNamespaeImport and it is just an exported namespace-import

How it was tested

For tests, I used the same tests currently used for exportImportStarAs, but I replaced all the imports
From:

import * as ns from './file'
export {ns}

To:

export * as ns from './file'

[nirshar]

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