Add support for integrated terminals (MVS, SSH, TSO)

[zFernand0]

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

Implement z/OS terminal leveraging the VSCode built-in functionality

Describe the solution you'd like

Have an MVS, SSH, and TSO integrated terminals in VSCode

Describe alternatives you've considered

Implement as webviews

Additional context

Inspired by:

• Contribute z/OS console panel #2925

[github-actions]

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[adam-wolfe]

Linking to #1784, since a TSO console would be necessary for interacting with REXX scripts.