Performance optimization: Only register request and response loggers when needed

[jl-martins]

First of all, thanks for this plugin. I've been actively using it and it's really great!

Recently, I ran cProfile on a Scrapy spider that I'm developing and the results suggest that the request and response loggers are each consuming approximately 9% of the execution time. I did the same for the BooksSpider from the scrapy-playwright examples and got the same results:

Is there some reason to register these handlers when the log level of the scrapy-playwright logger is higher than DEBUG?

If not, I can open a PR to only register these handlers when the log level is less than or equal to DEBUG.

[elacuesta]

Awesome, thanks for the thorough report. No reason, feel free to open a PR if you'd like :)

[jl-martins]

Thanks for the fast response @elacuesta. I've opened #336 to implement this optimization.