Add manifest for Search ALL Blocks plugin

[RhettTien]

Submit a new Plugin to Marketplace

Plugin GitHub repo URL:logseq-search-all-blocks

GitHub releases checklist

• a legal package.json file.
• a valid CI workflow build action for Github releases. (theme plugin for this).
• a release which includes a release zip pkg from a successful build.
• a clear README file, ideally with an image or gif showcase. (For more friendly to users, it is recommended to have English version description).
• a license in the LICENSE file.

⚠️ The new incoming plugin recommended fields in manifest.json:
supportsDB - [optional] Whether the plugin supports database graph.
supportsDBOnly - [optional] Whether the plugin only supports database graph.