CAMEL-23615: Add camel plugin list command

[davsclaus]

Summary

• Add new camel plugin list command that shows all available plugins (installed, bundled, and known 3rd party)
• camel plugin get now only shows installed plugins
• The old --all flag on camel plugin get is deprecated (hidden) and delegates to camel plugin list
• Documented in 4.21 upgrade guide

Test plan

• PluginGetTest — 3 tests pass (empty, installed, generated dependency)
• PluginListTest — 2 tests pass (default plugins, all plugins)
• Manual: camel plugin get shows only installed
• Manual: camel plugin list shows installed + bundled + 3rd party
• Manual: camel plugin get --all still works (delegates to list)

Claude Code on behalf of Claus Ibsen

[github-actions]

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[gnodet]

Well-structured refactoring of the plugin CLI commands:

• New PluginList extends PluginGet to list all available plugins (installed, bundled, and 3rd party) — cleanly reuses Row and printRows() from the parent.
• PluginGet refocused to only show installed plugins. The --all flag is deprecated and hidden, with backward-compatible delegation to PluginList.doCall().
• Row and printRows() visibility changed from private to package-private for subclass reuse.
• Test updates reflect the new output format (added "Installed plugins:" header).
• ParameterExceptionHandlerTest updated to accommodate the new list subcommand in error output.
• Upgrade guide entry and doc updates included.

The maxWidth bump from 50 to 80 on the DESCRIPTION column in printRows() is a nice UX improvement for the wider output.

LGTM.

Fully automatic review from Claude Code

[github-actions]

🧪 CI tested the following changed modules:

• docs
• dsl/camel-jbang/camel-jbang-core
• dsl/camel-jbang/camel-jbang-plugin-tui

⚠️ Some tests are disabled on GitHub Actions (@DisabledIfSystemProperty(named = "ci.env.name")) and require manual verification:

• dsl/camel-jbang/camel-jbang-core: 1 test(s) disabled on GitHub Actions

💡 Manual integration tests recommended:

You modified dsl/camel-jbang/camel-jbang-core. The related integration tests in dsl/camel-jbang/camel-jbang-it are excluded from CI. Consider running them manually:

mvn verify -f dsl/camel-jbang/camel-jbang-it -Djbang-it-test

All tested modules (6 modules)

• Camel :: JBang :: Core
• Camel :: JBang :: MCP
• Camel :: JBang :: Plugin :: Route Parser
• Camel :: JBang :: Plugin :: TUI
• Camel :: JBang :: Plugin :: Validate
• Camel :: Launcher :: Container

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