Include GitHub users that are part of the organizations

[UlisesGascon]

For #79 we need to identify the users and roles of the community members, so we will need to provide:

• New workflow that fetch all the organization members
• Store that information in tables with relations like github_users, github_roles and github_organization_members.

[bjohansebas]

This looks interesting and it could be useful for another package I have planned to display GitHub teams, I will work on this

[bjohansebas]

Ideally, we can use this API to obtain the members of an organization, which would primarily be registered in the github_users table. Then, in the github_organizations_member table, the relationship with the github_organizations table would be established, allowing us to retrieve the members of an organization.

The roles of the users still need to be researched a bit more because there are both teams with permissions and individual permissions granted to members.