Feat: Password visibility feature in Sign Up Page

[SumitPareek2401]

Describe the feature

Password visibility feature should also be available on the sign-up screen to make it easy for the user to insert the password.

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Actual screen:

Expected screens:

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[SumitPareek2401]

@Yashshukla11 Assign me this issue so that I can merge it immediately.

[Shubham-Zone]

@Yashshukla11 assign this to me i am GSSOC'24 contributor and have 2+ years of experience in flutter

[aikansh008]

please assign this issue to me