feat: Add snapshot class management page

Created by: weili520

What type of PR is this?

/kind feature

What this PR does / why we need it:

Which issue(s) this PR fixes:

• The last part of work about ##2930 (closed)
• Add snapshot class management page

Special notes for reviewers:

• snapshot class list page

• snapshot class detail page

• create snapshot class

Does this PR introduced a user-facing change?

Add snapshot class management page

Additional documentation, usage docs, etc.:

Requirements:

• KubeSphere version should be greater than 3.3