Allow excluding specific traits from completion

To be accurate, only their methods are excluded, the trait themselves are still available.

I also excluded a bunch of std traits by default. Some less opinionated, like `AsRef`, which should never be used directly except in generic scenarios (and won't be excluded there), some more opinionated, like the ops traits, which I know some users sometimes want to use directly. Either way it's configurable.

It should be pretty easy to extend support to excluding only specific methods, but I didn't do that currently.

Traits configured to be excluded are resolved in each completion request from scratch. If this proves too expensive, it is easy enough to cache them in the DB.

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