Improve cmdline colors in Console

[Dandelionym]

Why are these changes needed?

This PR enhances the readability of multi-agent conversations in the command line interface by improving the color display system. By adding colorama support with proper type definitions, agent messages are now more distinguishable with customizable colors, making it easier to follow conversations between different agents in the terminal.

Related issue number

Enhances UI readability. No specific issue number.

Checks

• I've included any doc changes needed for https://microsoft.github.io/autogen/. See https://github.com/microsoft/autogen/blob/main/CONTRIBUTING.md to build and test documentation locally.
• I've added tests (if relevant) corresponding to the changes introduced in this PR.
• I've made sure all auto checks have passed.

[Dandelionym]

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[Dandelionym]

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[ekzhu]

Can we use native coloring code e.g.

# Define ANSI escape sequences for text colors
RED = '\033[31m'
GREEN = '\033[32m'
YELLOW = '\033[33m'
BLUE = '\033[34m'
MAGENTA = '\033[35m'
CYAN = '\033[36m'
RESET = '\033[0m'  # Resets the text to default color

# Example usage
print(f"{RED}This text is red.{RESET}")
print(f"{GREEN}This text is green.{RESET}")
print(f"{YELLOW}This text is yellow.{RESET}")

We don't need to introduce a new dependency just for coloring. For more advanced features like markdown formatting that requires dependencies, we should use autogen-ext package instead of autogen-agentchat.

[ekzhu]

To make it easier to use, we can automatically assign colors based on the source field observed in the message stream. Each new source gets assigned a new color based on a predefined or an automatically generated sequence of colors.

for example:

def color_generator(step=30):
    """Yields an infinite sequence of distinct RGB colors."""
    hue = 0  # Start from 0
    while True:
        hue = (hue + step) % 360  # Keep hue within 0-360
        r, g, b = hue_to_rgb(hue)
        yield (r, g, b)

def hue_to_rgb(hue):
    """Convert a hue (0-360) to an RGB color (0-255) manually."""
    x = (255 * (1 - abs((hue / 60) % 2 - 1)))  # Intermediate color mixing
    if 0 <= hue < 60:
        return (255, int(x), 0)
    elif 60 <= hue < 120:
        return (int(x), 255, 0)
    elif 120 <= hue < 180:
        return (0, 255, int(x))
    elif 180 <= hue < 240:
        return (0, int(x), 255)
    elif 240 <= hue < 300:
        return (int(x), 0, 255)
    else:
        return (255, 0, int(x))

# Example usage:
color_seq = color_generator()
for _ in range(10):  # Generate 10 distinct colors
    print(next(color_seq))

[ekzhu]

To convert RGB to ANSI color code using approximation. For example:

def rgb_to_ansi_256(r, g, b):
    """Convert RGB (0-255) to the closest ANSI 256 color."""
    if r == g == b:
        if r < 8:
            return 16
        if r > 248:
            return 231
        return round(((r - 8) / 247) * 24) + 232  # Grayscale range

    return 16 + (36 * round(r / 255 * 5) + 6 * round(g / 255 * 5) + round(b / 255 * 5))

def ansi_256_color_text(text, r, g, b):
    """Wrap text with ANSI escape codes for 256-color mode."""
    color_code = rgb_to_ansi_256(r, g, b)
    return f"\033[38;5;{color_code}m{text}\033[0m"

# Example usage:
print(ansi_256_color_text("Hello in 256-color!", 255, 100, 50))

[ekzhu]

We can enable automatic coloring by default. The colormap can be a simple boolean type for turning on or off the color printing feature. If in the future a custom colormap is needed, we can come back and add a dictionary option to this parameter.

[ekzhu]

We need unit test for this feature to ensure it is working. Please add unit tests to verify colors are added when printing to console. For example,

import pytest

def my_function():
    print("Hello, pytest!")

def test_my_function(capsys: pytest.CaptureFixture[str]) -> None:
    my_function()
    captured = capsys.readouterr()
    assert captured.out.strip() == "Hello, pytest!"