feat(storage): add storage support to application resource #852

Job	Run time
Build	1m 37s
Integration (1.6.*, 5.19/stable, lxd, 5.19, 2.9)	44m 18s
Integration (1.6.*, 5.19/stable, lxd, 5.19, 3)	35m 9s
Integration (1.6.*, 5.19/stable, microk8s, 1.28, 2.9)	9m 40s
Integration (1.6.*, 5.19/stable, microk8s, 1.28-strict, 3)	10m 20s
Integration (1.7.*, 5.19/stable, lxd, 5.19, 2.9)	35m 20s
Integration (1.7.*, 5.19/stable, lxd, 5.19, 3)	34m 53s
Integration (1.7.*, 5.19/stable, microk8s, 1.28, 2.9)	10m 2s
Integration (1.7.*, 5.19/stable, microk8s, 1.28-strict, 3)	9m 57s
Integration (1.8.*, 5.19/stable, lxd, 5.19, 2.9)	47m 32s
Integration (1.8.*, 5.19/stable, lxd, 5.19, 3)	30m 41s
Integration (1.8.*, 5.19/stable, microk8s, 1.28, 2.9)	8m 38s
Integration (1.8.*, 5.19/stable, microk8s, 1.28-strict, 3)	9m 27s
	4h 47m 34s

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