FR: Adjust number of rows and columuns in Bliss Launcher
## Summary
Allow adjusting the number of rows and columns in Bliss Launcher
## Description
<!--Give several use case scenarios formated with the following pattern:-->
<!-- REQN: As a user..., I want to..., In order to... -->
<!-- Examples: -->
<!-- REQ1: As a user of App Lounge, I want to be able to Ignore the session refresh dialog, in order to not fall in a infinite loop when the token dispenser cannot provide me a token-->
<!-- REQ2: As a user of App Lounge, I want to be able to install an app by just clicking on the "Install" button right from the search results, in order to install several apps in a row-->
REQ1: As a user of Bliss Launcher, I want to be able to set the number of columns to 5 instead of 4, in order to have more apps on the desktop.
REQ2: As a user of Bliss Launcher, I want to be able to set the number of columns to 7 instead of 6, in order to have more apps on the desktop.
<!--List test case that will be run to validate that the issue is working as expected -->
<!--Add the labels corresponding to your issue by adding a tilde and typing the name of the label you think apply to your issue in the line above. You need to type a tilde before the name of each label you want to apply to the issue. -->
Related https://gitlab.e.foundation/e/backlog/-/issues/1251 was closed due to lack of activity.
issue