refactor: Introduce BooleanDelimiters class

[claremacrae]

Description

A pure refactoring:

• Add class BooleanDelimiters that will grow to manage tracking of (...) and "..." in Boolean instructions
• BooleanField now has a constructor which uses BooleanDelimiters.allSupportedDelimiters()
• Add checkRegExpsIdentical() to aid refactoring regular expressions
• Add multiple tests to BooleanField.test.ts

Motivation and Context

Preparing to work on:

• Allow parenthesis to be used in search strings in boolean filters #1308
• malformed boolean query for valid regex search that includes () #1500

How has this been tested?

• Unit tests
• Exploratory testing

Types of changes

Internal changes:

• Refactor (prefix: refactor - non-breaking change which only improves the design or structure of existing code, and making no changes to its external behaviour)
• Tests (prefix: test - additions and improvements to unit tests and the smoke tests)

Checklist

• My code follows the code style of this project and passes yarn run lint.
• My change has adequate Unit Test coverage.

Terms

• My contribution follow this project's contributing guide
• I agree to follow this project's Code of Conduct