chore(lib): re-organizing the module

This PR refactors a lot of the code in order to have a better organized codebase. If will that I needed to create a second level of submodules, to better distinguish the different parts of this project.

manim_slides/core/logger.py

@@ -0,0 +1,55 @@
+"""
+Logger utils, mostly copied from Manim Community.
+
+Source code:
+https://github.com/ManimCommunity/manim/blob/d5b65b844b8ce8ff5151a2f56f9dc98cebbc1db4/manim/_config/logger_utils.py#L29-L101
+"""
+
+import logging
+
+from rich.console import Console
+from rich.logging import RichHandler
+
+__all__ = ["logger"]
+
+HIGHLIGHTED_KEYWORDS = [  # these keywords are highlighted specially
+    "Played",
+    "animations",
+    "scene",
+    "Reading",
+    "Writing",
+    "script",
+    "arguments",
+    "Invalid",
+    "Aborting",
+    "module",
+    "File",
+    "Rendering",
+    "Rendered",
+    "Pressed key",
+]
+
+
+def make_logger() -> logging.Logger:
+    """
+    Make a logger similar to the one used by Manim.
+
+    :return: The logger instance.
+    """
+    RichHandler.KEYWORDS = HIGHLIGHTED_KEYWORDS
+    rich_handler = RichHandler(
+        show_time=True,
+        console=Console(),
+    )
+    logger = logging.getLogger("manim-slides")
+    logger.setLevel(logging.getLogger("manim").level)
+    logger.addHandler(rich_handler)
+
+    if not (libav_logger := logging.getLogger("libav")).hasHandlers():
+        libav_logger.addHandler(rich_handler)
+
+    return logger
+
+
+logger = make_logger()
+"""The logger instance used across this project."""