Make pools directly configurable with long size and disable leak detection by default

[chrisvest]

No description provided.

[chrisvest]

@hyperxpro FYI This makes the leak detector dramatically more scalable. The resize stalls are not eye-ball noticeable anymore, but latency spikes can still appear when measured more closely, I presume. The leak detector is now also turns it off by default.

[chrisvest]

Confirmed that the IdentityHashSet subtrees get a reasonable spread after a conversion from flat array into tree mode.

Histogram of sizes of subtrees after treeMode conversion at 823.061 entries

Number of items in subtree => number of subtrees with this many items
0 => 0
1 => 0
2 => 0
3 => 0
4 => 0
5 => 0
6 => 0
7 => 0
8 => 0
9 => 0
10 => 0
11 => 0
12 => 0
13 => 0
14 => 0
15 => 0
16 => 0
17 => 0
18 => 0
19 => 0
20 => 0
21 => 0
22 => 0
23 => 0
24 => 0
25 => 2
26 => 1
27 => 1
28 => 3
29 => 5
30 => 7
31 => 19
32 => 27
33 => 50
34 => 47
35 => 97
36 => 115
37 => 162
38 => 193
39 => 256
40 => 345
41 => 433
42 => 477
43 => 560
44 => 618
45 => 759
46 => 797
47 => 860
48 => 897
49 => 946
50 => 922
51 => 884
52 => 904
53 => 824
54 => 782
55 => 685
56 => 649
57 => 580
58 => 471
59 => 403
60 => 348
61 => 279
62 => 220
63 => 198
64 => 126
65 => 118
66 => 83
67 => 68
68 => 49
69 => 38
70 => 30
71 => 13
72 => 10
73 => 8
74 => 5
75 => 4
76 => 2
77 => 1
78 => 1
79 => 0
80 => 2