Rename namespaced contextual components

[alex-ju]

📌 Summary

Rename namespaced contextual components as follows:

• Alert::Link::Standalone to Alert::LinkStandalone
• ApplicationState::Footer::Link::Standalone to ApplicationState::Footer::LinkStandalone
• Form::Checkbox::Group::Checkbox::Field to Checkbox::Group::CheckboxField
• Form::Radio::Group::Radio::Field to Form::Radio::Group::RadioField
• Form::Toggle::Group::Toggle::Field to Form::Toggle::Group::ToggleField
• Toast::Link::Standalone to Toast::LinkStandalone

The new names are more idiomatic, will align these instances with other subcomponents, and provide a smooth path when imported to gts.

Note: As this is a major change, we'll try to add codemods in this PR to help with migrating to the new format.

🔗 External links

Jira ticket: HDS-2972

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👀 Component checklist

• Percy was checked for any visual regression
• A11y tests have been run locally (yarn test:a11y --filter="COMPONENT-NAME")
• If documenting a new component, an acceptance test that includes the a11yAudit has been added
• A changelog entry was added via Changesets if needed (see templates here)

💬 Please consider using conventional comments when reviewing this PR.

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[didoo]

All good for me 👍

Question: should we provide also a codemod for the consumers?
Saw your message in Slack. Let me know when the codemod is added so I can review it as well