Add `logging` to centralized checks

[scbedd]

But when we add this logging, we need to do all of the stuff we didn't do when originally using logging library.

• Central logging configuration which honors CLI args --quiet (ERROR) --verbose (DEBUG)
• Central logging configuration which, if no CLI args, also honors CLI variable LOG_LEVEL. Possible values:
  • DEBUG
  • INFO
  • WARNING
  • ERROR
  • CRITICAL

Code proposal

# ci_tools/logging.py
logger = logging.getLogger("azure-sdk-tools")
def configure_logging(
    level: str = "INFO",
    fmt: str = "%(asctime)s [%(levelname)s] %(name)s: %(message)s"
) -> None:
    """
    Configures the shared logger. Should be called **once** at startup.
    """
    
    numeric_level = getattr(logging, level.upper(), None)
    # parse cli arg, and compare to numeric level?
    # parse LOG_LEVEL environment variable
   
    if not isinstance(numeric_level, int):
        raise ValueError(f"Invalid log level: {level}")
    logger.setLevel(numeric_level)
    # Propagate logger config globally if needed
    logging.basicConfig(level=numeric_level)

# azpysdk/main.py
from ci_tools.logging import logger

# ...main code after parse args
parse common CLI arg for --quiet or --verbose
configure_logging(args.level)

and anywhere else we need it

from ci_tools.logging import logger
logger.info()
logger.critical()
...