Add create-namespace command

[jnmt]

Description

This PR adds the create-namespace CLI command.

Related issues and/or PRs

• Add namespace-creation feature #322

Changes made

• Add the create-namespace CLI command.
• Remove the obsolete command, MultiLedgersValidation.

Checklist

The following is a best-effort checklist. If any items in this checklist are not applicable to this PR or are dependent on other, unmerged PRs, please still mark the checkboxes after you have read and understood each item.

• I have commented my code, particularly in hard-to-understand areas.
• I have updated the documentation to reflect the changes.
• I have considered whether similar issues could occur in other products, components, or modules if this PR is for bug fixes.
• Any remaining open issues linked to this PR are documented and up-to-date (Jira, GitHub, etc.).
• Tests (unit, integration, etc.) have been added for the changes.
• My changes generate no new warnings.
• Any dependent changes in other PRs have been merged and published.

Additional notes (optional)

N/A

Release notes

Added the create-namespace command.

[gemini-code-assist]

Summary of Changes

Hello @jnmt, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the client-side tooling by introducing a dedicated command for creating namespaces. This new utility streamlines the process of setting up new namespaces, improving the overall manageability and user experience for interacting with the system.

Highlights

• New Command Added: A new command-line tool, create-namespace, has been introduced to facilitate the creation of namespaces.
• Core Logic Implementation: The core logic for creating namespaces is implemented in the new NamespaceCreation.java class, handling command-line arguments and interacting with the client service.
• CLI Integration: The create-namespace command is integrated into the main ScalarDlCommandLine utility, making it accessible to users and categorized under a new 'manage namespaces' section.
• Comprehensive Testing: Dedicated unit tests have been added for the NamespaceCreation command, ensuring its functionality and robustness across different scenarios, including gateway and non-gateway configurations, and error handling.

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[gemini-code-assist]

Code Review

This pull request introduces a new "create-namespace" command, allowing users to create namespaces via the command-line client. The changes include updating the "build.gradle" file to define the new task, adding the "NamespaceCreation.java" class for the command logic, and integrating it into the "ScalarDlCommandLine" tool. Comprehensive unit tests for the new command and its integration have also been added, ensuring proper functionality and error handling. The overall implementation is clean and follows existing patterns.

[Copilot]

Pull request overview

This PR adds a new create-namespace command-line tool to the ScalarDL client, enabling users to create namespaces via the command line. The implementation follows established patterns in the codebase for command-line tools.

Key Changes

• New NamespaceCreation command class that extends AbstractClientCommand and invokes ClientService.createNamespace()
• Comprehensive test suite covering success cases, gateway/non-gateway configurations, and error handling
• Integration of the new command into the ScalarDL command-line interface with proper help text and grouping

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
client/src/main/java/com/scalar/dl/client/tool/NamespaceCreation.java	Implements the create-namespace command with --namespace option
client/src/test/java/com/scalar/dl/client/tool/NamespaceCreationTest.java	Provides comprehensive test coverage following established test patterns
client/src/main/java/com/scalar/dl/client/tool/ScalarDlCommandLine.java	Registers the new command and adds it to the "manage namespaces" section
client/src/test/java/com/scalar/dl/client/tool/ScalarDlCommandLineTest.java	Updates expected help output to include the new command
client/build.gradle	Configures build task and distribution for the new command, but unexpectedly removes MultiLedgersValidation

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[feeblefakie]

LGTM! Thank you!