Draft: add phone field with country selector

[CGastrell]

WIP: DO NOT MERGE

Part of FORMS-196

Proposed changes:

This PR explores a new field for phone number with country code selector

Other information:

• Have you written new tests for your changes, if applicable?
• Have you checked the E2E test CI results, and verified that your changes do not break them?
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Jetpack product discussion

none yet

Does this pull request change what data or activity we track or use?

No

Testing instructions:

TBD

[github-actions]

Are you an Automattician? Please test your changes on all WordPress.com environments to help mitigate accidental explosions.

• To test on WoA, go to the Plugins menu on a WoA dev site. Click on the "Upload" button and follow the upgrade flow to be able to upload, install, and activate the Jetpack Beta plugin. Once the plugin is active, go to Jetpack > Jetpack Beta, select your plugin (Jetpack), and enable the add/jetpack-forms-international-phone-number branch.
• To test on Simple, run the following command on your sandbox:

bin/jetpack-downloader test jetpack add/jetpack-forms-international-phone-number

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[github-actions]

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[jp-launch-control]

Code Coverage Summary

Coverage changed in 1 file.

File	Coverage	Δ%	Δ Uncovered
projects/packages/forms/src/blocks/contact-form/class-contact-form-block.php	282/409 (68.95%)	-2.99%	17 💔

8 files are newly checked for coverage. Only the first 5 are listed here.

File	Coverage
projects/packages/forms/src/blocks/field-phone-number/edit.js	0/10 (0.00%) 💔
projects/packages/forms/src/blocks/field-phone-number/index.js	0/2 (0.00%) 💔
projects/packages/forms/src/blocks/field-phone-number/save.js	0/2 (0.00%) 💔
projects/packages/forms/src/blocks/input-country-list/edit.js	0/13 (0.00%) 💔
projects/packages/forms/src/blocks/input-country-list/index.js	0/3 (0.00%) 💔

Full summary · PHP report · JS report

_{Coverage check overridden by Coverage tests to be added later Use to ignore the Code coverage requirement check when tests will be added in a follow-up PR .}