`parseFee` and `parseTypeConfig` mutate input config param

[minhnhathoang]

Problem

subarray() returns a view. reverse() mutates original config in-place.

Impact

In handler, entity.config gets corrupted:

  entity.config = event.params.poolKey.config    // same reference

  entity.fee = parseFee(event.params.poolKey.config)         // bytes reversed
  const raw = parseTypeConfig(event.params.poolKey.config)   // bytes reversed

  entity.save()  // entity.config now has corrupted bytes

Fix

Clone before reversing in parseFee() and parseTypeConfig()