Use `binary.BigEndian.PutUint64` for sim.Asset

[manoranjith]

Location

[backend/sim/asset]

Problem

Currently, we use perunio.Encode method to encode the asset. This couples the sim.Asset to a specific serialization implementation.

Proposal

As suggested by @matthiasgeihs in the review of 272, use binary.BigEndian.PutUint64 directly for marshalling the sim.Asset which is of type int64.