Improve devcontainer to dockerfile

[vncoelho]

According to the standard in https://containers.dev/guide/dockerfile, it will be better for us to move to a specific dockerfile instead of "image": "mcr.microsoft.com/devcontainers/base:ubuntu"

This dockerfile will also be used for the UTs for neo-cli

[vncoelho]

I just tested here and they are different.
The dockerfile for devcontainer would need to be different because there are limited images available there.

[vncoelho]

in fact it will be necessary because of libleveldb-dev to neo-modules