feat: file upload middleware

[krsbx]

Just a file upload middleware so the file can be saved to disk or passed to firebase firestorage or aws s3

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Latest commit: 7ef0fa1

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[yusukebe]

I cannot merge it. Sorry.

[krsbx]

@yusukebe sorry to bring this thing up again but is it cool if we just add this one the node-adapter instead? if yes, then i'll make a PR there

[yusukebe]

Hi @krsbx

You do not need to create a PR immediately, but I would like to think more about file uploads. So, I will not merge it, but I will reopen this PR so that I do not forget it. Thanks.