Deal with forms like "have got" and "have got to"

The English past participle "got" can appear in two constructions that are not actually perfects:

1. We've got another half an hour of light.
2. You've got to find Henry.

In (1), "have got" is a possessive, and in (2), "have got to" is a modal. We'd rather not extract those by default, but we should probably create options to include them.

Actually, there's another modal-like construction, "have come to" (see stub (3) below). I'm not sure whether that should be in or out. It's a bit like an [inchoative verb](https://en.wikipedia.org/wiki/Inchoative_verb).

3. I've come to believe that ...

No files, tests, or entry points are named. Start by locating the extractor logic for present-perfect forms and its existing configuration or option handling; define how “have got,” “have got to,” and “have come to” should be treated before implementing. Done means the chosen constructions are consistently included or excluded, with options and coverage for the examples in the issue.

Written by the indexing model from the issue text.