refactor: streamline color handling in CLI output

- Replaced the `C` function with a more descriptive `colorize` function for applying color codes in the CLI.
- Updated all instances of color application in the `cli.py` file to use the new `colorize` function for consistency and clarity.
- Removed unnecessary imports and cleaned up whitespace in `basic_usage.py` for improved readability.

Author: chenxingqiang

python/examples/basic_usage.py

@@ -10,7 +10,6 @@
 """
 
 import tracesmith as ts
-import sys
 
 
 def main():

python/tracesmith/__init__.py

@@ -23,7 +23,7 @@
 - Python and C++ APIs
 """
 
-from ._tracesmith import (
+from ._tracesmith import (  # noqa: I001 - imports organized by category
     # Version info
     __version__,
     VERSION_MAJOR,