Add new attribute initialvalue to the form-field

[gongte1937]

Description of changes

Update the form-field.component and FormFieldOptions so the form could accept default value input.

Issue #, if available

It is regarding to this issue

Description of how you validated changes

I have used yarn build and yarn pack to pack the package and install it from my project, and tested the functionality. And it works fine.

Checklist

• Have read the Pull Request Guidelines
• PR description included
• yarn test passes and tests are updated/added
• PR title and commit messages follow conventional commit syntax
• If this change should result in a version bump, changeset added (This can be done after creating the PR.) This does not apply to changes made to docs, e2e, examples, or other private packages.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[changeset-bot]

🦋 Changeset detected

Latest commit: 8a7493e

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 14 packages

Name	Type
@aws-amplify/ui-angular	Patch
@aws-amplify/ui	Patch
@aws-amplify/ui-react-auth	Patch
@aws-amplify/ui-react-core-auth	Patch
@aws-amplify/ui-react-core-notifications	Patch
@aws-amplify/ui-react-core	Patch
@aws-amplify/ui-react-liveness	Patch
@aws-amplify/ui-react-native-auth	Patch
@aws-amplify/ui-react-native	Patch
@aws-amplify/ui-react-notifications	Patch
@aws-amplify/ui-react-storage	Patch
@aws-amplify/ui-react	Patch
@aws-amplify/ui-vue	Patch
@aws-amplify/ui-react-geo	Patch

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[gongte1937]

can someone take a look at this PR