Phone numbers not supporting different country codes

[nus-se-script]

1. Add a new patient using edit T0123456A p+6588888888

Expected: In the case that not all patients are from the same country (e.g. coming over for travels and not having a Singapore number), it would be useful to be able to add the country code like +65 and +44

Actual: Application currently does not support the addition of things that are not numbers (like + or other indications)

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_{[original: nus-cs2103-AY2324S2/pe-interim#2881] [original labels: severity.Low type.FeatureFlaw]}

[Jayne1010]

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