Typing: Accept BaseException for set_error and related functions #290

Right now, the error argument for set_error(), send_error(), and send_error_with_context() are typed as Exception:

However, a lot of Python APIs dealing with exception information are typed as BaseException in most stubs/type checkers (e.g. sys.exc_info() or logging.LogRecord.exc_info). When handling this kind of data and translating it into calls to AppSignal, it would be convenient if AppSignal’s functions accepted BaseException instead of Exception (as far as I’m aware, there’s no difference in their interfaces; Exception exists purely to distinguish error types that should always exit/crash from others in the class hierarchy).

As it currently stands, most type checkers will flag this as a problem:

from appsignal import set_error
from logging import Handler, LogRecord

class MyHandler(Handler):
    def emit(self, record: LogRecord) -> None:
        if record.exc_info and record.exc_info[1] is not None:
            set_error(record.exc_info[1]) # <-- Argument of type "BaseException"
                                          #     cannot be assigned to parameter
                                          #     "error" of type "Exception" in
                                          #     function "set_error"

It would be nice if that just worked without needing to add extra code or comments to ignore the type errors.