chore(edgeless): move templates to AFFiNE side

[doouding]

• Remove all built-in templates besides stickers template
• Modify builtIn template to allow extension by user side

Extend template

import {
    type TemplateManager,
    type Template,
    EdgelessTemplatePanel
} from '@blocksuite/blocks';

// Implement your own template manager
const cutsomManager = {
    list(category: string): Promise<Template[]>  {
      // list the templates of given categories
    }
    categories(): Promise<string[]> {
      // list all the categories
    }
    search(keyword: string, category?: string): Promise<Template[]> {
      // search templates by keyword in the given category
    }
} satisfies TemplateManager;

// You can extend templates to retain built-in templates
EdgelessTemplatePanel.templates.extend(cutsomManager);

// Or you can just replace the built-in templates entirely
EdgelessTemplatePanel.templates = cutsomManager;

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[doodlewind]

Can't wait to make this happen! Could you add a example about how to define custom template for third party developers in PR description? Thanks!