Allow giving reasons for disallowed_types

[JamesHinshelwood]

Similar to #7609 but for the disallowed_type lint. The permitted form of configuration is the same as for disallowed_methods.

changelog: Allow giving reasons for [disallowed_type]

[rust-highfive]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @giraffate (or someone else) soon.

Please see the contribution instructions for more information.

[giraffate]

Can you add an example with reason like this?

rust-clippy/clippy_lints/src/disallowed_method.rs

Lines 21 to 30 in 9205e3d

	/// # clippy.toml
	/// disallowed-methods = [
	/// # Can use a string as the path of the disallowed method.
	/// "std::boxed::Box::new",
	/// # Can also use an inline table with a `path` key.
	/// { path = "std::time::Instant::now" },
	/// # When using an inline table, can add a `reason` for why the method
	/// # is disallowed.
	/// { path = "std::vec::Vec::leak", reason = "no leaking memory" },
	/// ]

[JamesHinshelwood]

Thanks for the review @giraffate . I hope I've now addressed both of your comments.

[giraffate]

@bors r+

It looks good, thanks!

[bors]

📌 Commit 886cbb1 has been approved by giraffate

[bors]

⌛ Testing commit 886cbb1 with merge 77dda9c...

[bors]

☀️ Test successful - checks-action_dev_test, checks-action_remark_test, checks-action_test
Approved by: giraffate
Pushing 77dda9c to master...