allow/block list improvement: mns remove .massa if specified

[thomas-senechal]

Context
ATM, the DeWeb server config file only handles addresses and MNS domains without the ".massa". We should improve this system to remove the ".massa" before storing in memory, if specified by users.

How to

In MNS pkg

• Implement a function that:
  • takes a list of strings
  • returns a list of string
  • check every strings from the input and removes ".massa" suffix
  • returns the modified list
• Implement tests to ensure this is working properly

In API config

• Use this function in API config load
• Test the changes