No limit on phone number size for student addition

[juliussneezer04]

There is no limit to size of phone number that can be added to a student. This can cause a bug where huge phone numbers can be added, that severely slow down the app.

Steps to reproduce:

1. Add student with phone number 9.99999 x 10^999

Expected: Error to block this operation Actual: (truncated)

This also makes scrolling very long

[nus-pe-bot]

Team's Response

Rejected as it is the exact copy of this example

Items for the Tester to Verify

:question: Issue response

Team chose [response.Rejected]

• [ ] I disagree

Reason for disagreement: [replace this with your explanation]

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:question: Issue severity

Team chose [severity.Low] Originally [severity.Medium]

• [ ] I disagree

Reason for disagreement: [replace this with your explanation]

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