WIP_Add Django Debug Toolbar

[FroggyFlox]

Initial commit adding Django Debug Toolbar #2939

• Add django-debug-toolbar package to the optional dev dependency group
• Add --dev flag to build.sh to run poetry install with that flag
• Add DjDTB to settings.py
• Add DjDTB urls

This pull request is created with the only purpose to illustrate what would need to be implemented to use Django Debug Toolbar.
Ideally, all changes to settings.py and urls.py would need to be scripted as well so that no manual configuration would be required.

To run this branch, first checkout, then build from source with the new --dev flag. For instance, I run the following:

cd /opt/rockstor
systemctl stop rockstor rockstor-pre rockstor-build rockstor-bootstrap postgresql && systemctl start postgresql && ./build.sh --dev && poetry run initrock && systemctl enable --now rockstor-bootstrap && poetry run debug-mode ON

Note that DEBUG must be True for the toolbar to show up.

[Hooverdan96]

Suggested change

	DEBUG_TOOLBAR_CONFIG = {
	# Update to the latest AJAX request
	# Without this, we can only catch the initial request
	# which is not helpful in most of our cases
	"UPDATE_ON_FETCH": True
	}
	DEBUG_TOOLBAR_CONFIG = {
	# Update to the latest AJAX request
	# Without this, we can only catch the initial request
	# which is not helpful in most of our cases
	"UPDATE_ON_FETCH": True
	# If using htmx, to retain toolbar handle
	# through page renders add this
	"ROOT_TAG_EXTRA_ATTRS": "hx-preserve"
	}

If the project is contemplating to use htmx (#2735 and #2821) then this would also be required (among other things of course to enable htmx overall), according to:
https://django-debug-toolbar.readthedocs.io/en/stable/tips.html#working-with-htmx-and-turbo