feat: More capable accessors

[iwoplaza]

Accessors could always provide:

• Comptime-known values
• tgpu.fn functions that return a value matching the schema
• Buffer usages and buffer shorthands that hold the schema

Now, accessors can provide:

• tgpu.const references
• tgpu.*Var references
• Shell-less functions
• Deep references to nested structures (with regular callbacks)
• comptime functions that are ran when requesting the value

There's also a new resource: tgpu.mutableAccessor. It's currently functionally the same as tgpu.accessor but with a more restricted API, and with future PRs, values accessed from regular accessors will be immutable.

Things to do in subsequent PRs:

• fix: Disallow mutating uniforms and readonly storage #2015
• fix: Restrict mutating values through a non-mutable accessor #2013

[github-actions]

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