IGNITE-27726 CLI: Add color theme configuration for improved readability

[PakhomovAlexander]

Summary

Adds configurable color themes to improve CLI readability on terminals with different background colors (light vs dark). Previously, CLI colors were hardcoded for dark backgrounds only, making output difficult to read on light-themed terminals.

https://issues.apache.org/jira/browse/IGNITE-27726

Changes

New Configuration Option

• Added ignite.cli.color-scheme config key
• Users can switch themes via: cli config set ignite.cli.color-scheme <theme>

Available Themes

Theme	Description
solarized-dark	Default. Solarized Dark palette - excellent readability on dark backgrounds
solarized-light	Solarized Light palette - excellent readability on light backgrounds
dark	High-contrast colors for dark backgrounds
light	Dark colors optimized for light backgrounds

Architecture

• ColorScheme enum: Defines ANSI 256-color codes for each theme (UI colors + syntax highlighting)
• ColorSchemeProvider interface: Enables dynamic color scheme resolution
• AnsiStringSupport: Refactored to use semantic Color enum that resolves to actual ANSI codes based on current scheme
• Color scheme is read from config on each use, so changes take effect immediately without restart

Themed Components

All CLI output components now respect the color scheme:

• Status indicators (node status, cluster status)
• REPL prompts (connected/disconnected states)
• Syntax highlighting (SQL, JSON, HOCON)
• Error messages and warnings
• UI elements (options, commands, URLs)

[PakhomovAlexander]

three new themes added: solirized-dark, solirized-light, light (dark -- the old one, not shown in screenshots)