info: update plugin section to show installed path

[thaJeztah]

This updates the pretty-print format of docker info to provide more
details on installed plugins, to help users find where a specific
plugin is installed (e.g. to update it, or to uninstall it).

Before this patch:

Client:
 Context:    desktop-linux
 Debug Mode: false
 Plugins:
  buildx: Docker Buildx (Docker Inc., v0.8.2)
  compose: Docker Compose (Docker Inc., v2.4.1)
  sbom: View the packaged-based Software Bill Of Materials (SBOM) for an image (Anchore Inc., 0.6.0)
  scan: Docker Scan (Docker Inc., v0.17.0)

Server:
...

With this patch applied:

docker info

Client:
 Context:    desktop-linux
 Debug Mode: false
 Plugins:
  buildx: Docker Buildx (Docker Inc.)
    Version:  v0.8.2
    Path:     /usr/local/lib/docker/cli-plugins/docker-buildx
  compose: Docker Compose (Docker Inc.)
    Version:  v2.4.1
    Path:     /usr/local/lib/docker/cli-plugins/docker-compose
  sbom: View the packaged-based Software Bill Of Materials (SBOM) for an image (Anchore Inc.)
    Version:  0.6.0
    Path:     /usr/local/lib/docker/cli-plugins/docker-sbom
  scan: Docker Scan (Docker Inc.)
    Version:  v0.17.0
    Path:     /usr/local/lib/docker/cli-plugins/docker-scan

Server:
...

- Description for the changelog

- A picture of a cute animal (not mandatory but encouraged)

[thaJeztah]

@rumpl @ndeloof I opened this after I was helping @dockertopia with instructions on installing/uninstalling compose; and while the "path" information can be found, it's currently a bit complicated, for example, see

cli/contrib/completion/bash/docker

Line 5406 in 5eb24bf

COMPOSE_PLUGIN_PATH=$(docker info --format '{{range .ClientInfo.Plugins}}{{if eq .Name "compose"}}{{.Path}}{{end}}{{end}}')

So, I thought; perhaps we should print it by default in the output of docker info; WDYT? (too verbose? okay?)

[thaJeztah]

FWIW; initially I had Vendor: on a separate line as well, but that felt a bit "too verbose" (and probably "irrelevant" information for most day-to-day uses)

[thaJeztah]

From our call, looks like @rumpl also liked this change, so let's merge it 👍