fix(core): unaligned array in protobuf decoder

[mmilata]

Protobuf decoder is failing some newly added Rust assertions by creating unaligned slice: https://blog.rust-lang.org/2024/05/02/Rust-1.78.0.html#asserting-unsafe-preconditions

Draft: haven't tried this with 1.78+, there might be more such slices

[matejcik]

won't this fail again if something pushes the whole enum entry block out of alignment?

[mmilata]

yeah, it's an ad-hoc fix, i suppose that we should use something like construct.Aligned or construct.AlignedStruct on the python side