Auto merge of #10736 - NotAPenguin0:master, r=Alexendoo

initial clippy::ref_pattern implementation

This implements a new lint that discourages the use of the `ref` keyword as outlined in #9010. I think there are still some things to improve about this lint, but I need some feedback before I can implement those.

- [x] ~~Maybe it's desirable that a quick fix is listed too, instead of a generic `avoid using the ref keyword` lint.~~
- [x] `let ref x = y` already has a lint (`clippy::toplevel_ref_arg`). This implementation will report this too, so you get two lints for the same issue, which is not great. I don't really know a way around this though.
- [X] The dogfood test is currently failing locally, though I ran `cargo clippy -- -D clippy::all -D clippy::pedantic` and got no output, so I'm not sure why this is.

Any help with these would be greatly appreciated.

fixes #9010
changelog: [`ref_pattern`]: newly added lint

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