add readOnly and canRequestFocus properties

[ArAmM7]

Checklist

• I have bumped the version in pubspec.yaml
• I have added an entry in changelog.md for the new pubspec version
• (not required if no sensible change has been made eg: Localization) I have added tests that prove my fix is effective or that my feature works.

[Copilot]

Pull request overview

This PR adds two new properties to the PhoneFormField widget to provide better control over the text input behavior: readOnly and canRequestFocus. These properties are passed through to the underlying TextField widget, allowing users to make the phone input read-only or prevent it from receiving focus.

• Added readOnly property with default value false to control whether the field accepts text input
• Added canRequestFocus property with default value true to control whether the field can receive focus
• Version bumped from 10.0.14 to 10.0.15 with corresponding changelog entries

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
lib/src/phone_form_field.dart	Declared the two new boolean properties readOnly and canRequestFocus with appropriate default values
lib/src/phone_form_field_state.dart	Passed the new properties through to the underlying TextField widget
test/phone_form_field_test.dart	Added comprehensive test coverage for both properties, including property verification and behavioral tests
pubspec.yaml	Bumped version from 10.0.14 to 10.0.15
CHANGELOG.md	Added entries documenting the new properties for version 10.0.15

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[cedvdb]

thanks