[IN-404] Add autosuggest validation methods

[imndaiga]

Description

What is the motivation for this pull request?

Implement regex and api based input validation methods

What is the solution?

• Add findPossible3wa, isPossible3wa and isValid3wa validation methods based off the python wrapper.
• Deprecates the valid3wa validation method.
• Adds tests for findPossible3wa, isPossible3wa and isValid3wa
• Refactors autosuggest.spec.ts tests
• Updates README.md with validation use case/examples

What areas of the site does it impact?

N/A

How to test?

Type of change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [x] This change requires a documentation update

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes
• [x] Any dependent changes have been merged and published in downstream modules