Fixing multiple issues

[alsoto25]

Description

Fixing a few issues found on the repo. Initially I had each fix in a different branch, however since they were made before the testing branch was added, each branch had a lot of conflicts, so I decided to just compile all the changes into a single conflicts for each branch.

• Fixing deep cloning
  • Issues affected:
    • The deep cloning of config is removing all HTMLElement references #33
• Allow hidden or not-visible inputs to be validated and sent through form
  • Also added matching documentation and tests for this.
  • Issues affected:
    • Inputs with type="hidden" are not being sent with the form object #22
    • Allow for hidden inputs to be validated #27
• Fixing rules default validation
  • Issues Affected:
    • Default rules showing incorrect validation #32
• Fixing documentation to correctly show addFieldRule parameters
  • Issues Affected:
    • Fix readme for addFieldRule for message as it's not required #25
• Fixing issue that wasn't allowing messages to be passed as functions when creating the rules on the initializer
  • Issues Affected:
    • Make rules from config able to pass function as message #24
• Fixing Playwright tests that weren't passing

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Refactoring (non-breaking change with no user-facing impact)
• Breaking change (fix or feature that changes existing behavior)
• Documentation update
• Configuration (changes to build setup, tooling, or CI/CD)
• Chore (maintenance, code cleanup, or minor non-functional tasks)
• Test (adding or updating tests)

Related Issues

• The deep cloning of config is removing all HTMLElement references #33
• Inputs with type="hidden" are not being sent with the form object #22
• Allow for hidden inputs to be validated #27
• Default rules showing incorrect validation #32
• Fix readme for addFieldRule for message as it's not required #25
• Make rules from config able to pass function as message #24

Testing

Tested locally using the dev environment
Also tested with the Playwright automated tests.