refactor: update cmdlets and docs

[bhumitra]

Summary

Enhancement:

• Breaking Change: Refactored Set-SddcCertificateAuthority to support OpenSSL Certificate Authority configuration.
• Breaking Change: Refactored Get-EsxiCertificateThumbprint and Get-vCenterCertificateThumbprint to a single function Get-VCFCertificateThumbprint.
• Added Request-VcfCsras a wrapper for Request-EsxiCsr and Request-SddcCsr
• Added Install-VcfCertificate as a wrapper for Install-EsxiCertificate and Install-SddcCertificate.

Documentation:

• Added reference guide for VMware Cloud Foundation Certificate Operations.

Chore:

• Updated cmdlet content in the /docs/documentation.

Type

• Bugfix
• Enhancement or Feature
• Code Style or Formatting
• Documentation
• Refactoring
• Chore
• Other

Breaking Changes?

• Yes, there are breaking changes.
• No, there are no breaking changes.

Test and Documentation

• Tests have been completed.
• Documentation has been added or updated.

Issue References

Closes #60
Closes #61
Closes #63

Additional Information

[tenthirtyam]

Approved and will merge shortly. Given that there are breaking changes but this is early in the module's development, I will forego requiring a major version bump.

I made some updates in b51a373.

[github-actions]

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