Ensure safety of indirect dispatch

[teoxoy]

Ensure safety of indirect dispatch by injecting a compute shader that validates the content of the indirect buffer.

Part of #2431.

Depends on #6318.

[cwfitzgerald]

See Atomic issue and other small nits

EDIT from @ErichDonGubler: added a link for atomic issue

Addressed comments

[teoxoy]

I don't know why github it not letting me "rebase and merge":

Via the CLI is also not working.

gh pr merge 5714 -r -R gfx-rs/wgpu
GraphQL: This branch can't be rebased (mergePullRequest)

[teoxoy]

I will just squash and merge, losing 6619f3a is not the end of the world.

[schell]

I'm tracking trunk in my project and just hit a panic in these changes:

thread 'test::unlit_textured_cube_material' panicked at /Users/schell/.cargo/git/checkouts/wgpu-53e70f8674b08dd4/59f56e0/wgpu-core/src/indirect_validation.rs:288:58:
called `Option::unwrap()` on a `None` value

I'm guessing it's this binding binding_size on line 276 in the file mentioned:

        let binding_size = calculate_src_buffer_binding_size(buffer_size, limits);

being used on line 288:

                size: Some(NonZeroU64::new(binding_size).unwrap()),

...so for some reason in my case binding_size is 0. Maybe the buffer passed is 0? 🤷