Rename `LogRecord` type alias to `LogDict`

[FichteFoll]

The fact that LogRecord is defined as a type alias that is not logging.LogRecord while logging.LogRecord is also thrown around (e.g. in add_fields) is very confusing.

python-json-logger/src/pythonjsonlogger/core.py

Line 78 in e7761e5

LogRecord: TypeAlias = Dict[str, Any]

I strongly advise to pick a different name for this to differentiate it from the logging class, for example LogDict. This is also a strong contender for v4 imo.

[nhairs]

This is a good proposal. Even when refactoring I had issues keeping track which type of object I was working with (which I why I ended up adding the type alias in the first place).

If we are making breaking changes it might be worth changing some of the arguments as well so it's clear what is what. Maybe log_dict + LogDict and record + logging.LogRecord.