Fix TypeInfo generated by impl_common_traits!

[csmnprschv]

The TypeInfo impl generated by impl_common_traits! declared the
affected types as a composite struct wrapping Vec<u8>, which tells
metadata-based decoders to expect a Compact<u32> length prefix
followed by bytes.

The Encode impl (via ark_scale::ArkScaleRef) writes raw bytes with
no length prefix, so PJS fails when decoding:
    Compact input is > Number.MAX_SAFE_INTEGER

Delegate to ArkScale's TypeInfo so the type metadata matches the
actual encoding.

[csmnprschv]

Before:

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After: