add the ability to store last eval in variable.

[lorrydriveloper]

Add the ability to store the last eval in a variable configured through the web_console.config, default is _

I always found it a bit annoying that when working with the web_console, I always forget to store in a variable whatever I'm trying, so if it is what I expect, keep working on that return for more trying/error, especially when working with complicated queries or trying out a mutation in an array or something along that lines. Where you get the desired value, but it is lost as it is not stored anywhere.

I have plans to work in the UI as I have some ideas I would like to see if they make sense to implement.
There is a lot of code around to make development a bit easier, but I'm unsure how to make it work/setup. Some docs about it will help people work more in this gem.

Screen.Recording.2023-11-27.at.22.13.40.mov

[lorrydriveloper]

@gsamokovarov, this has been open for a long time, and I haven't had a comment or any feedback. Please let me know if it is not a desired feature, and you/I can close it, Thanks.