Support custom logging levels in logger stdlib package

### Describe the Bug

Custom log levels are configured via methods that are dynamically added to the class, which causes some false positives for us

We should at least narrow the object to contain that attribute, but if the logger is configured at the top level it wouldn't apply to nested scopes unless we do https://github.com/facebook/pyrefly/issues/40, AND if the logger is configured in some factory function then we're out of luck

```
import logging

# Define a custom TRACE level (value 5, lower than DEBUG's 10)
TRACE_LEVEL_NUM = 5
logging.addLevelName(TRACE_LEVEL_NUM, "TRACE")

def trace(self, message, *args, **kws):
if self.isEnabledFor(TRACE_LEVEL_NUM):
self._log(TRACE_LEVEL_NUM, message, args, **kws)

# Add the trace method to the standard Logger class
logging.Logger.trace = trace

# --- Usage Example ---
# Configure the root logger to handle the TRACE level
logging.basicConfig(level=TRACE_LEVEL_NUM)
logger = logging.getLogger(__name__)

logger.trace("A custom trace message with value %s", 5) # false positive error here
logger.debug("A standard debug message")
```

from https://youtrack.jetbrains.com/issue/PY-86719/Pyrefly-is-way-too-overzealous

### Sandbox Link

https://pyrefly.org/sandbox/?project=N4IgZglgNgpgziAXKOBDAdgEwEYHsAeAdAA4CeSIEAtsbgE4AuABFLgOZsTpsA66fAYiYARGJHQwmqJgGMArnAa4qTACoAlAIIBhAKIsYANxhQmACkOoocyQFYANC1wB3GHSYMAFhhG6AQgCqAOIA5HBMAIwADACUfBo6ugD6ADK6AGq6KUkAcgEAskwAvEy2fKwcXGyEqJiYKUYmOahUMGYJeqkZWbkFjjwgHboDcfxYYh50qDJtcCZgjq1waGwwjgBUqHRscBvrANbOcDGIfEznTBBgTHNQYIQQcLroqNiwmABi9O1anWmZ2Ty%2BROZwuYNu9ySFR%2BiS6AN6%2BUW8BWayk212THWByOo0ETE0dQ8nkkDCmMyYrS8uEwHlwRMkigwmC2NJS7FW7hkUFQy3K7KqhDZHDchFJ00kJTFMz4eIAtPKmAEUUxdPgWsRYEx5bK8dpcOhIGw5HQScSmHRcLhmBUObSmN4sJqvJIhgZjFA%2BZVuIRsDyIDI9QaIGwzLB3UUhnCekCYkxPbaSjaBasGEKOWYkkkXq1M7j0DaRVK2gNNLIFEoVEWKcjUKsmM4IF4mJZrJIAKRwAaOWyjAt0QiYGDYOQhks3BhMllMQfDtjV5a1mAjED2EBkE1gKCkUXKKAUIQABVIG63NyZeHwsn1huNqAYEH1hDxAGUYJJPAwGMQ4IgAPS-9cxC3Qh6DYX8YHQX9MFwGQ4F-GRr2DW9731X8mDAegpEsaBXk1BCgyNKYUPQJhcGIYi4CfdAyCpdBZWMOg4AfEiSgGABmQgIgAJgGPgQAAX1XaZ72MD5oBgCg0CwC8SHIfigA

### (Only applicable for extension issues) IDE Information

_No response_