add cert configurtaion

[zhzhuang-zju]

What type of PR is this?
/kind documentation

What this PR does / why we need it:
add cert configurtaion

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

[karmada-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[gemini-code-assist]

Summary of Changes

Hello @zhzhuang-zju, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a crucial update to the security considerations documentation by adding a dedicated section on certificate configuration. The aim is to empower users with a deeper understanding of how Karmada manages certificates for secure communication, offering insights into default settings and providing detailed instructions for customizing certificate parameters across various deployment methods. This enhancement significantly improves user control over the security posture of their Karmada environments.

Highlights

• New Documentation Section: A comprehensive 'Certificate Configuration' section has been added to the security considerations documentation.
• Installation Method Specifics: The new documentation details default certificate behaviors and customization options for Helm, karmadactl init, and Operator installation methods.
• Certificate Customization: Users can now find clear guidance on adjusting certificate validity periods, RSA key lengths, and how to utilize custom Certificate Authorities (CAs) for each deployment approach.

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[gemini-code-assist]

Code Review

This PR adds valuable documentation on certificate configuration for various Karmada installation methods. The content is clear and well-structured. I've found a few minor inconsistencies and typos that could be addressed to improve the documentation. Also, please note the typo in the pull request title ('configurtaion' should be 'configuration').

[gemini-code-assist]

This blank line is not present in the English version of the document. For consistency between the two documents, it's recommended to remove it.