feat(storage): add storage support to application resource #834

Job	Run time
Build	1m 40s
Integration (1.6.*, 5.19/stable, lxd, 5.19, 2.9)	31m 45s
Integration (1.6.*, 5.19/stable, lxd, 5.19, 3)	27m 26s
Integration (1.6.*, 5.19/stable, microk8s, 1.28, 2.9)	8m 30s
Integration (1.6.*, 5.19/stable, microk8s, 1.28-strict, 3)	9m 32s
Integration (1.7.*, 5.19/stable, lxd, 5.19, 2.9)	44m 37s
Integration (1.7.*, 5.19/stable, lxd, 5.19, 3)	39m 37s
Integration (1.7.*, 5.19/stable, microk8s, 1.28, 2.9)	8m 39s
Integration (1.7.*, 5.19/stable, microk8s, 1.28-strict, 3)	9m 2s
Integration (1.8.*, 5.19/stable, lxd, 5.19, 2.9)	26m 56s
Integration (1.8.*, 5.19/stable, lxd, 5.19, 3)	27m 19s
Integration (1.8.*, 5.19/stable, microk8s, 1.28, 2.9)	8m 44s
Integration (1.8.*, 5.19/stable, microk8s, 1.28-strict, 3)	9m 30s
	4h 13m 17s

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