CAMEL-23226: Enhance Shell with alias persistence and init script support

[gnodet]

JIRA: CAMEL-23226

Summary

Builds on top of PR #22161 (JLine 4 shell migration) to add:

• Alias persistence: Uses JLine's DefaultAliasManager with persistence file at ~/.camel-jbang-aliases, giving users alias/unalias commands to define shortcuts (e.g., alias ll="ls -la")
• Init script support: Loads ~/.camel-jbang-init.jline on shell startup for custom configuration (aliases, variables, key bindings)
• Tab completion improvements: JLine 4's native picocli integration provides better subcommand and option completion

Test plan

• Run camel shell and verify alias/unalias commands work
• Define an alias, exit shell, re-enter and verify alias persists
• Create ~/.camel-jbang-init.jline with an alias and verify it loads on shell start

[github-actions]

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[github-actions]

🧪 CI tested the following changed modules:

• dsl/camel-jbang/camel-jbang-core

All tested modules (26 modules)

• Camel :: Coverage
• Camel :: Coverage [pom]
• Camel :: JBang :: Core
• Camel :: JBang :: Core [jar]
• Camel :: JBang :: Integration tests
• Camel :: JBang :: Integration tests [jar]
• Camel :: JBang :: MCP
• Camel :: JBang :: MCP [jar]
• Camel :: JBang :: Main
• Camel :: JBang :: Main [jar]
• Camel :: JBang :: Plugin :: Edit
• Camel :: JBang :: Plugin :: Edit [jar]
• Camel :: JBang :: Plugin :: Generate
• Camel :: JBang :: Plugin :: Generate [jar]
• Camel :: JBang :: Plugin :: Kubernetes
• Camel :: JBang :: Plugin :: Kubernetes [jar]
• Camel :: JBang :: Plugin :: Route Parser
• Camel :: JBang :: Plugin :: Route Parser [jar]
• Camel :: JBang :: Plugin :: Testing
• Camel :: JBang :: Plugin :: Testing [jar]
• Camel :: JBang :: Plugin :: Validate
• Camel :: JBang :: Plugin :: Validate [jar]
• Camel :: Launcher
• Camel :: Launcher [jar]
• Camel :: Launcher :: Container
• Camel :: Launcher :: Container [pom]