gen: derive mappings with parameters

[tdakkota]

Description

PR #374 removed mapping for Photo -> InputPhotoFileLocation due to InputPhotoFileLocation requires ThumbSize field.

But gotdgen can generate mapping like AsInputPhotoFileLocation(thumbSize string) *tg.InputPhotoFileLocation, where thumbSize passed by user.

References

mappableFields returns possible As mapping. https://github.com/gotd/td/blob/9ce051b1eb02739de38fc6973b14fd4ccaa5aa98/internal/gen/fields.go#L28-L73

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