Fix FormFieldKey Initialization Error

[yashas-hm]

Summary

This PR addresses an issue where a _formFieldKey was being initialized too late, resulting in errors when attempting to interact with the form. The delayed initialization caused unexpected behavior.

Changes

• Initialized the _formFieldKey earlier in the widget initState.

Testing

• Verified that the form initializes correctly without errors.
• Tested form validation and submission to ensure expected behavior.
• Ran unit tests to confirm no regressions were introduced.

Issue

Fixes: #4

[Copilot]

Pull Request Overview

This PR fixes a timing issue with _formFieldKey initialization in the ChipsInputAutocomplete widget. The key was previously being initialized after the controller was configured, which caused errors when attempting to interact with the form.

Key changes:

• Moved _formFieldKey initialization to occur immediately after super.initState() and before controller setup
• Moved the assignment of _formFieldKey to the controller to occur right after controller initialization

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