feat(download): add --filename and --download-all options

[opswithranjan]

Support downloading packages when multiple share the same name/version
but differ by filename (e.g., .nupkg vs .snupkg).

• Add --filename option with glob pattern support (fnmatch)
• Add --download-all flag to download all matching packages
• Extract _search_packages() shared search logic in core
• Add resolve_all_packages() for multi-package resolution
• Add Filename column to multiple packages disambiguation table
• Update error messages to suggest --filename and --download-all
• Add unit and integration tests for new functionality
• Update README with new download examples

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation update
• Refactoring
• Other (please describe)

[Copilot]

Pull request overview

Adds new download disambiguation capabilities so users can select packages by filename (including glob patterns) and optionally download all matching packages when multiple artifacts share the same name/version.

Changes:

• Added --filename filtering (exact match via query; glob via client-side fnmatch) and a resolve_all_packages() resolver.
• Added --download-all mode to download every resolved match and enhanced multi-match output (table includes a Filename column).
• Updated tests and documentation (README + changelog) to cover the new CLI behavior.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
cloudsmith_cli/core/download.py	Extracts shared search logic into _search_packages(), adds filename filtering, adds resolve_all_packages(), and updates multi-match display.
cloudsmith_cli/cli/commands/download.py	Adds --filename and --download-all options and implements multi-package download flow.
cloudsmith_cli/core/tests/test_download.py	Adds unit tests for filename filtering, multi-resolution, and updated error/table output.
cloudsmith_cli/cli/tests/commands/test_download.py	Adds integration-style tests for --filename and --download-all behavior.
README.md	Adds download examples for --filename and --download-all (but also removes the logout entry from the command list).
CHANGELOG.md	Records the new options and table update, but converts Unreleased into a versioned 1.14.0 entry.

Comments suppressed due to low confidence (1)

cloudsmith_cli/cli/commands/download.py:65

• The --outfile help text says it's an output file path, but --download-all treats it as an output directory (and --all-files already uses it as a directory). This is user-facing and can be confusing; please update the option help (and/or validation) to clearly document the different semantics by mode, or introduce a separate --output-dir for multi-file/multi-package downloads.

@click.option(
    "--outfile",
    type=click.Path(),
    help="Output file path. If not specified, uses the package filename.",
)

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[estebangarcia]

I feel like this could use with a bit of a refactoring.

We have too many branches going on here. Whether one or many, we always want to do 2 things:

1. Find the package(s) to download
2. Download it/them

I would suggest refactoring this to break it down into those 2 steps, regardless of whether you are downloading one or many packages.