Add a validate address function

[thomas-senechal]

Context
We need a function that will check if an address is valid. This function must handle User and SC addresses.

This function will be especially useful for builders

User flow
Describe the user flow using user stories so the end result is super clear - PM

How to
List the step-by-step to get it do if needed - PM

Technical details
Give the technical insights so anyone in the team can tackle the tasks - Dev

QA testing
Does this task require some QA tests ?
If yes, explain how to validate it

[B-Naoufal]

I already added one in station, check : pkg/dnshelper/dnshelper.go
'func IsValidAddress(addr string) bool'

[thomas-senechal]

I already added one in station, check : pkg/dnshelper/dnshelper.go 'func IsValidAddress(addr string) bool'

This function does not handle User addresses and does not check for the length of the public key
That's why we can't just use it