feat: display docker scout hints on build and pull

[eunomie]

What I did

On docker build and docker pull commands, display a hint to docker scout quickview.

Hints are enabled by default. To disable them:

• use the --quiet/-q quiet flag
• set the DOCKER_CLI_HINTS environment variable with a false (according to Go) value
• add a -x-cli-hints configuration in ~/.docker/config.json file under {plugins: {-x-cli-hints: {enabled}}}

In case of build, if --push, --progress or --output flag are used, hints are not displayed to keep it working on main (and less advanced) case.

There's no hint for buildx build.

In case of a docker build the docker scout quickview command doesn't need an argument as it will take the most recently built image by default. In case of a docker pull the pulled image is extracted from the command arguments.

The output already handles plain/tty display:

Related issue

https://github.com/docker/team-ssc-dev-features/issues/306

(not mandatory) A picture of a cute animal, if possible in relation with what you did

[eunomie]

I updated some things:

• to disable them from the ~/.docker/config.json file
• to disable them with a more generic DOCKER_CLI_HINTS env variable
• to disable them in more advanced/unknown build scenario (use of progress, output. push flags)

[eunomie]

Also added a CliHintsEnabled() that can be used if we introduce more hints