Enhancements to code-input component

[tiagoboeing]

File: src/components/inputs/code-input/code-input.tsx

1. Accepts RegExp to validate values, like @Prop({ mutable: false }) validator?: RegExp = /^[0-9A-Za-z]+$/
2. Allow length property to be mutable
   2.1. For reasons like strict time to do, today length property is immutable because the internal calcs to fill input fields are calculated again when state changes.