fix(tx): fix WitnessRule and WitnessCondition deserialization

[ixje]

fixes #872

• WitnessRule deserialization failed because the type had to be converted to int first
• BooleanAndCondition deserialization failed because !!"00" evaluated to true not false.
• AndCondition deserialization failed because this was undefined when called here
  

  neon-js/packages/neon-core/src/tx/components/WitnessCondition.ts

  Line 95 in 7eb101a

  const implementingClass = this.getImplementation(witnessType);