[SPIRV] Add support of [[vk::ext_type_def]]

[jiaolu]

this is related
#3919

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❌ Build DirectXShaderCompiler 1.0.800 failed (commit f577c87138 by @jiaolu)

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[jaebaek]

I am really sorry for being late. I am experiencing intensive workloads. I will review it until tomorrow. I know this is a complicated one and I appreciate your strong contribution!

[jaebaek]

I will check how to define vk::ext_type, but could you please address my comments?
Let me know if you think sth of them are unclear (We can have email or video-call communications as well).

[jaebaek]

@jiaolu I sent a commit to your branch that allows us to put ext_type into vk namespace.

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[jiaolu]

hi, @jaebaek,
any comments to the latest change to the commits?

[jaebaek]

Sorry for being late.
LGTM. I have just a last comment.

Thanks!

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✅ Build DirectXShaderCompiler 1.0.892 completed (commit f3deab7273 by @jiaolu)