Add limit to length of IdentityUser.PhoneNumber.

[agreentejada]

Add limit to length of IdentityUser.PhoneNumber.

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Summary of the changes (Less than 80 chars)

Description

Currently, the PhoneNumber of IdentityUser has an unlimited maximum length. The largest phone number in the world is composed of 15 digits according to https://en.wikipedia.org/wiki/E.164. For additional information such as "+, - , (,), space", a good length looks to be 50.

[ghost]

Thanks for your PR, @agreentejada. Someone from the team will get assigned to your PR shortly and we'll get it reviewed.

[adityamandaleeka]

@HaoK PTAL

[HaoK]

Thanks for the PR, but this is a schema breaking change as the test failures demonstrate, this isn't something we can do without a version flag, we could add this to a list of the schema changes we can consider in .net 8 which is adding a new schema. @agreentejada can you file an issue requesting this schema update for the next identity ef model?