Add defgroup vterm-mgt for vterm-mgt

In the past I used `defconst` in many of my Elisp libraries where I should've
used something like:

```elisp
;; some/path/to/some-lib.el

(defgroup some-lib nil)

(defcustom some-lib-setting nil
  :group 'some-lib)
```

When I encounter code that I should've structured this way, I'm cleaning it up
to prefer this more idiomatic pattern.

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