Change UI to show list of containers with metadata in a table

[SvenAelterman]

Depending on the application setting for folder or container-level (#99), hide the container dropdown and list containers with metadata.

Considerations

• Retrieve container list and metadata only when a storage account is selected?
• Do not select the first storage account by default to avoid unnecessary retrieval and listing of containers?

Tasks

• Retrieve list of storage accounts that logged in user has access to.
• Method to list containers in a specific storage account that logged in user has access to.
• Calculate detail view for all accessible containers in a storage account.
• Create a method to retrieve RBAC assignments at any given scope:
  • Specify which scope and whether to filter for assignments that apply to a specific principal.
  • Shared between multiple calls.

[SvenAelterman]

Pending work (PR #103):

• Sort list of containers alphabetically
• Support for multiple subscriptions