feat: Resolve shell-less functions directly

[iwoplaza]

Also exporting isVariable and type Namespace, since they weren't before

[github-actions]

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https://pkg.pr.new/software-mansion/TypeGPU/typegpu@a76e95123bfadd00c0c2f24c161ec8db3ef5749d

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[aleksanderkatan]

LGTM! Just try to improve the error @cieplypolar mentioned

[cieplypolar]

  it('should throw descriptive error', () => {
    const main = (a: number) => {
      'kernel';
      return a + 1;
    };
    expect(() => asWgsl(main)).toThrowErrorMatchingInlineSnapshot(`
      [Error: Resolution of the following tree failed:
      - <root>
      - (a) => {
            "kernel";
            return a + 1;
          }
      - fn*:item_0: Identifier a not found]
    `);
  });

It should throw more descriptive error. I would expect Cannot infer argument type or something like that.

Apart from that awesome work 🚀