feat(common/models): support phrase predictions

[mcdurdin]

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

From a team review of the Keyman for Android UX (#7161)

At a minimum, phrase predictions are needed, rather than isolated word-by-word. More sophisticated models are really what we need, though, which is a major project. Still, if we don't make note it, it won't happen?

Per @jahorton:

• [JH] Fortunately, I left some hooks & design work in to help facilitate this. Definitely not enough to solve it outright, though.

Related issues

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Keyman for Windows/macOS/Linux/iPhone/iPad/Android:

• Device: Samsung A90 5G
• OS: Android 12
• Keyman version: 15.0.269-stable