Implement AsFormField for commonly used types

[m4tx]

• String
• Password
• Integer types
• Float types
• bool
• Choice between one of values (enum?)
• Date
• Time
• Datetime
• File
• Vec<u8> (different than File, i.e. doesn't save data on disk)
• URL
• E-mail
• Option<T>

[ElijahAhianyo]

@m4tx can you assign this to me