Add lint: panicking_query_methods

[BD103]

As per @alice-i-cecile's request! Part of #58.

This adds the bevy::panicking_query_methods lint, which searches for usage of panicking methods like Query::single(). It is currently Allow-by-default, so you need to explicitly opt-in to use it. (In the project it's under the Restriction category.)

This lint checks both Query and QueryState. I will write a lint for resources in another PR. :)

Testing

Wow, I'm so glad you asked! (You asked how to test this lint, right?)

It's a bit trickier than previous lints because it is off by default. 'Tis no matter: simply switch Allow to Warn locally:

declare_tool_lint! {
    pub bevy::PANICKING_QUERY_METHODS,
-    Allow,
+    Warn,
    "called a `Query` or `QueryState` method that can panic when a non-panicking alternative exists"
}

I used the following example when testing. Paste it into bevy_lint/examples/lint_test.rs, run cd bevy_lint, then run cargo build && cargo run -- --example lint_test.

use bevy::prelude::*;

#[derive(Component)]
struct MyComponent;

fn main() {
    App::new().add_systems(Update, my_system);

    let mut world = World::new();
    let mut query_state = QueryState::<&mut MyComponent>::new(&mut world);

    let _ = query_state.single_mut(&mut world);
}

fn my_system(query: Query<&MyComponent>) {
    let _ = query.many([]);
}

The warnings should look like this:

warning: called a `QueryState` method that can panic when a non-panicking alternative exists
  --> bevy_lint/examples/lint_test.rs:12:25
   |
12 |     let _ = query_state.single_mut(&mut world);
   |                         ^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: use `query_state.get_single_mut(&mut world)` and handle the `Result`
   = note: `#[warn(bevy::panicking_query_methods)]` on by default

warning: called a `Query` method that can panic when a non-panicking alternative exists
  --> bevy_lint/examples/lint_test.rs:16:19
   |
16 |     let _ = query.many([]);
   |                   ^^^^^^^^
   |
   = help: use `query.get_many([])` and handle the `Result`

warning: `bevy_lint` (example "lint_test") generated 2 warnings

Fiddle around with it and try to break it! Good luck, though. Unless you use #94, this is the most foolproof lint I've written so far! >:D

[janhohenheim]

There's a little list of panicking APIs in bevyengine/bevy#14275 FYI :)