validate-form-data

[CarlosACJ55]

• Require a complex enough password
• Ensure go code is not injected
• Return new errors that will be passed on straight to the UI
• Replace the use of the username to Firstname Lastname and remove that column from db
• Change frontend side to only take numbers in DOB (+ no future date) and add hypen based on the format (YYYY-MM-DD)

[CarlosACJ55]

This task has actually become huge. We need to create a bunch of types for each sort of data we want to accept and hide these structs through constructors, passing them down finally when its really needed. I am taking this over so @seoyoungcho213 can focus on DB implementation.