Add missing ERROR log level and TODO annotations for planned features

[Copilot]

LogType.ERROR was referenced in the README example but absent from the enum. Added it with an appropriate severity value between WARNING and CRITICAL. Also annotated logger.py and log_type.py with # TODO comments surfacing the planned improvements already listed in the README, making them discoverable in-editor.

Changes

src/logging_utility/log_type.py

• Added ERROR = 35 between WARNING (30) and CRITICAL (40)
• Added TODO for custom/user-defined severity levels

src/logging_utility/logger.py

• Added TODOs on log() for: configurable output targets, log rotation, custom formatter, and minimum-level filtering

# Before
class LogType(Enum):
    INFO = 10
    DEBUG = 20
    WARNING = 30
    CRITICAL = 40  # ERROR was missing — breaks the README example

# After
class LogType(Enum):
    INFO = 10
    DEBUG = 20
    WARNING = 30
    ERROR = 35
    CRITICAL = 40

Original prompt

List me some additions (potential TODOs) for this repo

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