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feat(h705): Introduce a function for conditional logic that evaluates regex (#710)

## Description

- Adds `regexMatch(value, pattern, flags?)` as a custom SurveyJS
expression function for regex-based conditional logic (`visibleIf`,
`enableIf`, etc.)
- Follows the existing `any-answered` pattern: pure function +
`FunctionFactory` registry + React hook, registered globally before
survey/Creator initialization
- Hub-only change; no API or Creator UI work

## Behavior

- Returns `true` when the value matches the pattern, `false` otherwise
- Uses `Helpers.isValueEmpty()` so empty strings, `null`, `undefined`,
and cleared checkbox `[]` are treated as unanswered
- Coerces scalar non-string values (e.g. numbers) to strings before
matching; `0` is a valid answer
- Invalid or missing patterns/flags return `false` without throwing or
logging errors
- Optional third parameter supports regex flags (e.g. `'i'` for
case-insensitive)

## Wiring

Registers `regexMatch` at all survey runtime and Creator entry points:

- Public survey-taking view
- Submission review runtime
- Form editor (Creator)
- Form preview
- Template preview

## Tests

- Unit tests for match/mismatch, edge cases, AC patterns (4-digit,
Korean mobile, `ABC-1234`, decimals, case-insensitive yes/no)
- Integration tests via `survey.runCondition()` and `visibleIf`
visibility toggling
- 19 tests passing

## Example

```text
regexMatch({q1}, '^\d{4}$') == true
```

Type single backslashes in the Creator expression box; JSON storage will
escape them automatically.

## Related Issues
#705 

## Type of Change
Check all that apply.

- [ ] 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)
- [ ] Documentation update
- [ ] Dependency update
- [ ] Refactoring (non-breaking change which improves code quality)
- [ ] Other (please describe)



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