Description

• Add a separate src/dfx-core/src/extension/manager/list.rs file for listing related functions.
• Add support to list remote extensions. The usage is described as below:
  1. dfx extensions list
     This will list the installed extensions
  2. dfx extensions list --catalog-url=<...>
     This will list the available extensions with the given catalog URL.
  3. dfx extensions list --available
     This will list the available extensions with the default catalog URL.

Below is an example of the output of the command:

$ dfx extension list --catalog-url=https://raw.githubusercontent.com/vincent-dfinity/dfx-extensions/main/catalog.json
Remote extensions:
  sns
  test
  nns

Fixes # (issue)

SDK-1636

How Has This Been Tested?

• Manually tested.
• New e2e tests added.

Checklist:

• The title of this PR complies with Conventional Commits.
• I have edited the CHANGELOG accordingly.
• I have made corresponding changes to the documentation.