Fix parse() to actually match the API SearchFox expects.

This is not ideal as a default behavior, but we are already printing
out the filename as we parse it, so it is consistent!  This makes it
easier for us to figure out why an IPDL file is not indexed in
searchfox by checking the index-log.  This could be better addressed
by introducing a concept of an error record that the parser could emit
into an analysis file so that we could display what's broken when
looking at the file in searchfox, potentially on an opt-in basis.

Print out errors when ignoring them.

The parser does not seem to like annotations inclusive of both the
`[ManualAlloc]` type added in
https://bugzilla.mozilla.org/show_bug.cgi?id=1736371 and the variations
that also include list of annotations in the patch that look like
`[ManualDealloc, ChildImpl=virtual, ParentImpl=virtual]`.

My efforts here are to try and get this to parse and technically
produce something usable, but I wouldn't be surprised if someone wanted
to properly consume the annotations that they would want something that
looks more strongly typed.  But this is an AST so maybe this is fine?

Add naive support for `[ManualAlloc, ChildImpl=virtual]` annotations.