Add Visa to Ego DB

[Buwujiu]

Detailed Description

Create tables for Visas, a java repo class to fetch Visas.
Make migrate scripts to create visa.

Refer to Bashar's NOtes: Sql DB Changes

CREATE TABLE GA4GHVISA (
  id                      UUID PRIMARY KEY,
  type                    ENUM,
  source                  varchar(255) NOT NULL,
  value                   varchar(255) NOT NULL,
  by                      varchar(255) NOT NULL,
);