🧹 Update github teams and access to be consistent with MDIP Governance

[e-lo]

After the approval of the governance #21 , add structure to Github repository that is consistent with it.

Todo:

• Develop Teams for organization consistent with governance
• Post a CODEOWNERS file for teams allowed to make normative changes to governance or principles
• Add branch access rules to prevent posting to main without a PR and approval from a CODEOWNER