Improved the code and speed of ToStorageItem<TOut>()

[d2dyno1]

Details of Changes
This PR improves the code and speed of ToStorageItem<TOut>().
Since getting instances of StorageFile and StorageFolder is resource heavy and slow, this PR mitigates the performance hole as much as possible.
Bundles widget heavily relies on this function and the performance increase is very noticeable (It's "you could test debug app against release app" noticeable)

For #4180

Validation
How did you test these changes?

• Built and ran the app
• Tested the changes for accessibility

[d2dyno1]

Ready!

[lukeblevins]

Great work. For those unfamiliar, @d2dyno1 and I discussed privately in chat how this PR reduces the calls to intensive functions pertaining to filesystem access.

[d2dyno1]

@duke7553

For this configuration:

Old logic (time in miliseconds, error unknown, DEBUG, performed using Stopwatch class):

0: 586
1: 439
2: 472
3: 735
4: 786
5: 715
6: 730
7: 764
8: 774
9: 736
10: 51
11: 76
12: 70
13: 73
14: 746
15: 717
16: 49
17: 75
18: 69
19: 76
20: 70
21: 83
22: 77
23: 76
24: 69
25: 57
26: 704
27: 53
28: 77
29: 70
30: 76
31: 70
32: 72

(lower is better)

New logic (time in miliseconds, error unknown, DEBUG, performed using Stopwatch class):
(Note that the new method didn't throw any exceptions whereas with old logic exceptions were present)

0: 85
1: 144
2: 85
3: 0
4: 0
5: 0
6: 0
7: 0
8: 0
9: 0
10: 175
11: 111
12: 105
13: 0
14: 0
15: 110
16: 96
17: 105
18: 98
19: 127
20: 121
21: 78
22: 71
23: 78
24: 72
25: 0
26: 75
27: 68
28: 71
29: 92
30: 84
31: 77
32: 62

(lower is better)