✨ feat(playground): add LaTeX rendering and markdown inspection scripts

Introduced `latex_render_case.py` for rendering LaTeX using matplotlib,
allowing for customizable background and text colors, dpi, and font size.
Additionally, added `inspect_markdownify.py` for converting markdown to
Telegram MarkdownV2 style, demonstrating integration with Telegram bot
for message sending.

playground/inspect_markdownify.py

@@ -0,0 +1,52 @@
+import textwrap
+
+import telegramify_markdown
+
+# Use textwrap.dedent to remove the leading whitespace from the text.
+md = textwrap.dedent(r"""
+# Title
+
+**Latex Math**
+Function Change:
+    \(\Delta y = f(x_2) - f(x_1)\) can represent the change in the value of a function.
+Average Rate of Change:
+    \(\frac{\Delta y}{\Delta x} = \frac{f(x_2) - f(x_1)}{x_2 - x_1}\) is used to denote the average rate of change of a function over the interval \([x_1, x_2]\).
+
+- Slope:222
+    \[
+    F = G\frac{{m_1m_2}}{{r^2}}
+    \]
+
+\[
+  F = G\frac{{m_1m_2}}{{r^2}}
+
+
+- Inline: \(F = G\frac{{m_1m_2}}{{r^4}}\)
+
+\(A = X × \left( (P)/100 \right) × (V)/365\)
+
+\(\text{R} = \frac{\text{EXAMPLE}}{\text{Any}}\)
+
+""")
+
+# export Markdown to Telegram MarkdownV2 style.
+converted = telegramify_markdown.markdownify(
+    md,
+    max_line_length=None,  # If you want to change the max line length for links, images, set it to the desired value.
+    normalize_whitespace=False,
+    latex_escape=False,
+)
+print(converted)
+# export Markdown to Telegram MarkdownV2 style.
+from dotenv import load_dotenv
+import os
+from telebot import TeleBot
+load_dotenv()
+telegram_bot_token = os.getenv("TELEGRAM_BOT_TOKEN", None)
+chat_id = os.getenv("TELEGRAM_CHAT_ID", None)
+bot = TeleBot(telegram_bot_token)
+bot.send_message(
+    chat_id,
+    converted,
+    parse_mode="MarkdownV2"  # IMPORTANT: Need Send in MarkdownV2 Mode.
+)

playground/latex_render_case.py

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+import matplotlib.pyplot as plt
+from io import BytesIO
+
+
+def render_latex_with_matplotlib(latex_expr, bg_color="#FFFFFF", text_color="#000000", dpi=300, font_size=20):
+    """
+    Renders a LaTeX math formula using matplotlib and saves it to a BytesIO object.
+
+    Parameters:
+        latex_expr (str): LaTeX math formula (e.g., r"$\int_a^b f(x) \, dx = F(b) - F(a)$")
+        bg_color (str): Background color in HEX format (default is white: "#FFFFFF")
+        text_color (str): Text (formula) color in HEX format (default is black: "#000000")
+        dpi (int): Dots per inch for rendered output (default: 300).
+        font_size (int): Font size for the formula text (default: 20).
+
+    Returns:
+        BytesIO: A BytesIO object containing the rendered formula as PNG.
+    """
+    # Create a figure with transparent axes and no ticks
+    plt.figure(figsize=(4, 2), dpi=dpi)
+    plt.axis('off')  # Hide axes
+
+    # Using the 'text' function to render LaTeX
+    plt.text(0.5, 0.5, latex_expr, color=text_color, fontsize=font_size, ha='center', va='center',
+             transform=plt.gca().transAxes, usetex=True)  # `usetex=True` enables LaTeX rendering in matplotlib
+
+    # Set the figure background color
+    plt.gcf().patch.set_facecolor(bg_color)
+
+    # Save the figure directly to BytesIO
+    buffer = BytesIO()
+    plt.savefig(buffer, format="png", bbox_inches='tight', pad_inches=0, transparent=True)
+    buffer.seek(0)
+    plt.close()
+
+    return buffer
+
+# Example usage:
+latex_formula = r"$F = G\frac{{m_1m_2}}{{r^2}}$"
+bg_color = "#F0F8FF"  # AliceBlue background
+text_color = "#000000"  # Black text color
+
+# Render the LaTeX math expression
+latex_bytesio = render_latex_with_matplotlib(latex_formula, bg_color=bg_color, text_color=text_color, font_size=30)
+
+# Save the rendered formula as a PNG file (optional)
+from PIL import Image
+
+img = Image.open(latex_bytesio)
+img.save("latex_matplotlib_rendered.png")