replace unnecessary Bytes with Vec<u8> and &[u8] in storage module

[MrCroxx]

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As in #74 , create or clone Bytes involves atomic operation, whose costs cannot be ignored if performs frequently (e.g. in iterators). Unnecessary Bytes should be replaced with Vec<u8> or &[u8].

[zackertypical]

lgtm

[MrCroxx]

@zackertypical Welcome, please make sure to run make fmt to lint the codw and resolve all warnings manually, otherwise CI would not pass.