Add new toolbars for users to use to allow more customizability

1. Added a commit by David Faure to add new toolbars when available
2. Added two new toolbars
3. Uncommented out the editToolBar.

The main purpose of this MR is to allow the users to enable a custom toolbar and then add to it all the docker buttons they wish to have (using MR !2419) and have it on a vertical bar for example. But of course there are more possibilities. The main idea is that it's possible to have more toolbars, so they don't have to be connected to the BrushesAndStuff things or appear horizontally on top of the window.

Test Plan

1. Make sure the toolbars are invisible by default.
2. They shouldn't break the undo/redo buttons
3. When enabled, they should appear in their own new line, NOT next to the BrushesAndStuff (which would push the workspace button to the left).

Formalities Checklist

• I confirmed this builds.
• I confirmed Krita ran and the relevant functions work.
• I tested the relevant unit tests and can confirm they are not broken. (If not possible, don't hesitate to ask for help!)
• I made sure my commits build individually and have good descriptions as per KDE guidelines.
• I made sure my code conforms to the standards set in the HACKING file.
• I can confirm the code is licensed and attributed appropriately, and that unattributed code is mine, as per KDE Licensing Policy.
• Does the patch add a user-visible feature? If yes, is there a documentation MR ready for it at Krita Documentation Repository?

Reminder: the reviewer is responsible for merging the patch, this is to ensure at the least two people can build the patch. In case a patch breaks the build, both the author and the reviewer should be contacted to fix the build. If this is not possible, the commits shall be reverted, and a notification with the reasoning and any relevant logs shall be sent to the mailing list, kimageshop@kde.org.