[CLI] Add `pull` to aspire cli tool

[kieronlanning]

Is there an existing issue for this?

• I have searched the existing issues

Is your feature request related to a problem? Please describe the problem.

I'd like to see the Aspire CLI include a pull command to enable pulling down/ updating the required images locally, in much the same way docker pull {image}:{tag} does for specific images, or docker compose pull does for docker-compose.y{a}ml files.

var sqlServer = builder
	.AddAzureSqlServer("sqlserver")
	.RunAsContainer(container => 
		container.WithImage(Platform.ContainerDetails.MsSqlImage).WithDataVolume()
	);

In this example it would pull down the image defined in the WithImage method.

Describe the solution you'd like

> aspire pull --help

Description:
  Pulls the latest versions of any Docker images used for in the AppHost

Usage:
  aspire pull [options] [[--] <additional arguments>...]]

Options:
  --apphost <apphost>                                                    The path to the Aspire apphost project file
  --summary <Json|Table|None>                                            Output format for pull results
  -?, -h, --help                                                         Show help and usage information
  -l, --log-level <Critical|Debug|Error|Information|None|Trace|Warning>  Set the minimum log level for console output (Trace, Debug, Information, Warning, Error, Critical)
  --nologo                                                               Suppress the startup banner and telemetry notice
  --banner                                                               Display the animated Aspire CLI welcome banner

Additional context

The reason this is useful is not only ensuring the 'latest' version when people rely on the :latest tag, but primarily for when people are traveling and have little or no access to a stable internet connection. Enabling this feature would allow them to, much like a git pull, resolve the latest dependencies locally prior to travelling.