Add a function to change the main authorizer to Useroverridable DKIM registry.

[SoraSuegami]

Description

I added a function that allows only the owner of the user overridable dkim registry to change the main authorizer.

Type of Change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• I have discussed with the team prior to submitting this PR
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• New and existing unit tests pass locally with my changes

[openzeppelin-code]

Add a function to change the main authorizer to Useroverridable DKIM registry.

Generated at commit: 1b7abedc58b08d2e4b5b17f46d109a0076afb1d9

🚨 Report Summary

	Severity Level	Results
Contracts	Critical High Medium Low Note Total	1 1 0 4 19 25
Dependencies	Critical High Medium Low Note Total	0 0 0 0 0 0

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