Multi-CDC-ACM Support (IDFGH-6350)

[moefear85]

I've modified some of the esp-idf & tinyusb files so that menuconfig exposes options to choose more than 1 USB-CDC-ACM channel. Please merge so everybody can benefit. Please see the patch files in the root folder. It only applies to a handful of files, not all of the files listed below. I'm a git noob.

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[Alvin1Zhang]

Thanks for your contribution.

[tore-espressif]

Hello @moefear85 ,
Thank you very much in your interest and contribution.

However, we can't accept Pull Requests in form of .patch files; it would have to be a regular git commit. Moreover, there is a lot of commented-out code and other details. Please see our contributing guide.
If you want to finish the PR yourself, could you please also change the target branch from release/v4.3 to master? This PR, as is, would pollute our git history.

We are internally working on expanding the CDC-ACM USB device, so we can provide more examples soon.

[tore-espressif]

Linking related issue #7020

[tore-espressif]

Commit 6330d5d is doing something similar but with only 2 channels.

The reason for this limitation is that USB peripheral implementation has only 6 hardware endpoints and one CDC channel needs 3 endpoints. That leaves us with max 2 CDC channels.