feat(storage): add storage support to application resource #829

Job	Run time
Build	1m 43s
Integration (1.6.*, 5.19/stable, lxd, 5.19, 2.9)	28m 13s
Integration (1.6.*, 5.19/stable, lxd, 5.19, 3)	33m 4s
Integration (1.6.*, 5.19/stable, microk8s, 1.28, 2.9)	9m 34s
Integration (1.6.*, 5.19/stable, microk8s, 1.28-strict, 3)	9m 24s
Integration (1.7.*, 5.19/stable, lxd, 5.19, 2.9)	22m 39s
Integration (1.7.*, 5.19/stable, lxd, 5.19, 3)	28m 22s
Integration (1.7.*, 5.19/stable, microk8s, 1.28, 2.9)	9m 37s
Integration (1.7.*, 5.19/stable, microk8s, 1.28-strict, 3)	10m 17s
Integration (1.8.*, 5.19/stable, lxd, 5.19, 2.9)	27m 50s
Integration (1.8.*, 5.19/stable, lxd, 5.19, 3)	28m 11s
Integration (1.8.*, 5.19/stable, microk8s, 1.28, 2.9)	8m 40s
Integration (1.8.*, 5.19/stable, microk8s, 1.28-strict, 3)	9m 11s
	3h 46m 45s

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