chore(event-handler): expose rest handler functionality

[svozza]

Summary

This PR exposes the REST API event handler under the namespace experimental-rest:

import {Router} from '@aws-lambda-powertools/event-handler/experimental-rest';

Changes

• Created an index.ts file so classes and functions can be imported from the the top level namespace
• Updated the exports and typesVersions sections of package.json
• Where applicable, updated the tests to use the the index.ts file to import classes and utilities.
• Renamed conversion functions *ToResponse to *ToWebResponse.

Issue number: closes #4456

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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