Allow recording partial hints, make --record_hints settable #3704
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(Based on #3703)
This PR allows to turn on --record_hints in the middle of a file, and record hints for only that top-level. All old hints are retained, except where overriden by the new ones. This is done by reading the old hints_db and overriding with the new hints_db before writing the new file.
If --record_hints is given for the entire file, we ignore the old hints and write a fresh file.
Internally there a few simplication like always using the with_hints_db wrapper, removing some branching on Options.record_hints().
Note: in the IDE, the hints file is not written out as we never "finish" checking a module. This PR does not change this.