[REQ] Add support for Helidon MP 2.x

Created by: tjquinno

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

The server generator currently supports Helidon 1.x MP servers. Helidon is at 2.x.

Describe the solution you'd like

The existing support for Helidon 1.x is of limited use, as Helidon 1.x has been superseded by 2.x. We should replace the existing 1.x support with support for Helidon 2.x.