Import - Improve phone validation (#12901)

Context : 
- Phones import is a bit complex if not all subfields are provided.
- Phones subfield validation are absent or different from BE validation.

Solution : 
- Normalize callingCode and countryCode validation (BE/FE)
- Ease phone import if only phoneNumber is provided

packages/twenty-shared/src/utils/index.ts

@@ -33,3 +33,5 @@ export { isValidLocale } from './validation/isValidLocale';
 export { isValidUuid } from './validation/isValidUuid';
 export { isValidVariable } from './validation/isValidVariable';
 export { normalizeLocale } from './validation/normalizeLocale';
+export { getCountryCodesForCallingCode } from './validation/phones-value/getCountryCodesForCallingCode';
+export { isValidCountryCode } from './validation/phones-value/isValidCountryCode';