feat: add explicit flag to CLI list command

[jjjermiah]

implements #1372

feature: add cli flag for pixi list so users can filter only for explicit packages using --explicit , additionally with -x

    -x, --explicit                       Only list packages that are explicitly defined in the project

List project's packages. Highlighted packages are explicit dependencies

Usage: pixi list [OPTIONS] [REGEX]

Arguments:
  [REGEX]  List only packages matching a regular expression

Options:
      --platform <PLATFORM>            The platform to list packages for. Defaults to the current platform
      --json                           Whether to output in json format
      --json-pretty                    Whether to output in pretty json format
      --sort-by <SORT_BY>              Sorting strategy [default: name] [possible values: size, name, kind]
      --manifest-path <MANIFEST_PATH>  The path to 'pixi.toml' or 'pyproject.toml'
  -e, --environment <ENVIRONMENT>      The environment to list packages for. Defaults to the default environment
      --frozen                         [env: PIXI_FROZEN=]
      --locked                         Check if lockfile is up-to-date before installing the environment, aborts when
                                       lockfile isn't up-to-date with the manifest file [env: PIXI_LOCKED=]
      --no-install                     Don't install the environment for pypi solving, only update the lock-file if it can
                                       solve without installing
  -x, --explicit                       Only list packages that are explicitly defined in the project
  -v, --verbose...                     Increase logging verbosity
  -q, --quiet...                       Decrease logging verbosity
      --color <COLOR>                  Whether the log needs to be colored [env: PIXI_COLOR=] [default: auto] [possible
                                       values: always, never, auto]
      --no-progress                    Hide all progress bars [env: PIXI_NO_PROGRESS=]
  -h, --help                           Print help

[tdejager]

Checked it out and works for me!

[jjjermiah]

Thanks @tdejager I also wanted to see if we could add short args for --json and --json-pretty

so users could use pixi ls -xj or pixi ls -xp

a problem I see with using p for json-pretty is the confusion it might cause for the --platform argument

• one alternative would be capital J but that might also be confusing since theres no capitalized arguments anywhere else in the software
• another alternative would be to use an alias jp

edit: I can create another issue for this implementation if there arent any glaring problems with this idea

[ruben-arts]

@jjjermiah The json output is for machine readable situations. This most often is used in scripts or code. I would not like to add shortcuts for those. As it mostly confuses readers of code what the actual flags mean while --json-pretty directly tells the reader what they can expect from the command.

[jjjermiah]

That makes a lot of sense!