Create a two-step mechanism to update group admins

[cedoor]

Description

The best practice to update a group admin is through a two-step update. The existing admin assigns the new potential admin, and the new admin accepts in a separate transaction. This prevents existing admins from making mistakes and assigning wrong addresses.

Open to naming suggestions.

Related Issue(s)

Closes #690

Checklist

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [x] I have run yarn prettier and yarn lint without getting any errors
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes
• [x] Any dependent changes have been merged and published in downstream modules

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[openzeppelin-code[bot]]

Create a two-step mechanism to update group admins

Generated at commit: 255bccf2ebc7a1ebfe06ebc7bb1bff2f8141fa83

🚨 Report Summary

	Severity Level	Results
Contracts	Critical High Medium Low Note Total	0 0 0 4 16 20
Dependencies	Critical High Medium Low Note Total	0 0 0 0 0 0

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