docs: refine api docs of Menus

[abose]

The new doc infrastructure does not work the same as the old docs framework, so made the following changes:

1. All APIS declared exports.* is the public API and it should come in the docs.
2. All APIs starting with an _ is a private api, even if its exported, and added @private tag to make it not appear in API docs.
3. Exported module EVENT_NAME constants should appear in docs.
4. ENUM declaration for exported named constants to appear in docs.
5. Some public APIs wont come up in docs if it doesnt have a jsdoc declaration, Eg. see openMenu api in this PR. so added a jsdoc section to missing public APIs to appear in docs.

[sonarcloud[bot]]

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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