feat(l1,l2): add CLI option to force color output mode

[ManuelBilbao]

Motivation

Recently changes turned off ANSI colors when TTY is not detected. This is sometimes annoying (e.g., with systemd).

Description

Add a --log.color flag (following --log.level format) with options auto (current and default behaviour), always and never

[Copilot]

Pull Request Overview

This PR adds a new CLI flag --log.color to control ANSI color output in logs, addressing the issue where colors are disabled when TTY is not detected (e.g., in systemd environments). The flag supports three modes: auto (default, current behavior), always (force colors), and never (disable colors).

Key Changes:

• Added LogColor enum with three variants: Auto, Always, and Never
• Implemented Display and FromStr traits for the LogColor enum to support CLI parsing
• Modified the tracing initialization logic to respect the new color mode setting

Reviewed Changes

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

File	Description
cmd/ethrex/cli.rs	Defines the LogColor enum, implements required traits, and adds the --log.color CLI option
cmd/ethrex/initializers.rs	Updates the tracing initialization to check the new log_color option before disabling ANSI colors

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[github-actions]

Lines of code report

Total lines added: 43
Total lines removed: 0
Total lines changed: 43

Detailed view

+-----------------------------------+-------+------+
| File                              | Lines | Diff |
+-----------------------------------+-------+------+
| ethrex/cmd/ethrex/cli.rs          | 620   | +41  |
+-----------------------------------+-------+------+
| ethrex/cmd/ethrex/initializers.rs | 464   | +2   |
+-----------------------------------+-------+------+