feat(storage): add storage support to application resource #865

Job	Run time
Build	1m 36s
Integration (1.6.*, 5.19/stable, lxd, 5.19, 2.9)	36m 2s
Integration (1.6.*, 5.19/stable, lxd, 5.19, 3)	30m 39s
Integration (1.6.*, 5.19/stable, microk8s, 1.28, 2.9)	8m 54s
Integration (1.6.*, 5.19/stable, microk8s, 1.28-strict, 3)	9m 33s
Integration (1.7.*, 5.19/stable, lxd, 5.19, 2.9)	35m 26s
Integration (1.7.*, 5.19/stable, lxd, 5.19, 3)	31m 36s
Integration (1.7.*, 5.19/stable, microk8s, 1.28, 2.9)	10m 5s
Integration (1.7.*, 5.19/stable, microk8s, 1.28-strict, 3)	10m 4s
Integration (1.8.*, 5.19/stable, lxd, 5.19, 2.9)	33m 52s
Integration (1.8.*, 5.19/stable, lxd, 5.19, 3)	30m 21s
Integration (1.8.*, 5.19/stable, microk8s, 1.28, 2.9)	8m 45s
Integration (1.8.*, 5.19/stable, microk8s, 1.28-strict, 3)	9m 27s
	4h 16m 20s

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