Add get_default_configure to simplify user creation of SurfaceConfiguration

[jinleili]

Checklist

• Run cargo clippy.
• Run RUSTFLAGS=--cfg=web_sys_unstable_apis cargo clippy --target wasm32-unknown-unknown if applicable.
• Add change to CHANGELOG.md. See simple instructions inside file.

Description
Most users don't really need to care about the values of usage, format, present_mode, and possibly alpha_mode, color_space, etc. when configuring SurfaceConfiguration. It is only necessary to understand and specify these fields if the user has a clear need for them. impl Default simplifies the use of users.

Bgra8UnormSrgb is set as the default format value because it is the only format supported by all platforms. Although Bgra8Unorm and Rgba8Unorm are defined in the WebGPU spec, metal actually only supports Bgra8Unorm as the texture format for the SwapChain

Testing
Tested examples locally

[kpreid]

Adding Default seems like it might be a future compatibility risk. What if some new backend results in there being no single always-supported format? How about instead making it a method on Surface (or Device, or a function in wgpu::util) that accepts a width and height, and returns a configuration?

[jinleili]

All field values within SurfaceConfiguration should have a valid default value (exclude width and height), it's just that this value may be reinterpreted in different backends, as in the case of Auto for alpha_mode.

If used as an util function, additional surface and adapter are also required to obtain values that can actually be supported

[cwfitzgerald]

I think the biggest problem here is that FIFO isn't actually available everywhere - this is a problem I discovered after starting to tell people that FIFO works everywhere 😬 - wayland doesn't actually have any presentation mode other than MAILBOX.

[jinleili]

@cwfitzgerald Is it acceptable to use AutoNoVsync instead of Fifo here?

[cwfitzgerald]

Sorry, this one has had a lot of revisions

[cwfitzgerald]

LGTM after one nit