mem-track: Peak memory tracking options with per-id sampling

[TristonianJones]

Using the observer pattern, introduce peak memory tracking using the AggregateSize functions.

The cost of tracking scales with the size of the objects being tracked and the size of the expression.
If inputs in list are expected to be roughly the same size, or there's a high volume of entries, using
sampling to lower the overall cost of tracking while still roughly preserving the intent

Workload	Evaluation Configuration	Time (ns/op)	Cost vs Baseline	Memory (B/op)	Allocs (allocs/op)
List Concatenation a + a	Baseline (None)	205.7	1.00x	288	5
	Cost Tracking	259.4	1.26x	320	6
	Memory Tracking (Sample = 1)	325.7	1.58x	288	5
	Memory Tracking (Sample = 5)	324.7	1.58x	288	5
	State Tracing	284.6	1.38x	288	5
	Cost + Memory Tracking	356.8	1.73x	320	6
	Cost Tracking + State Tracing	316.5	1.54x	320	6
	Memory Tracking + State Tracing	406.3	1.98x	288	5
	All Options Enabled	414.3	2.01x	320	6
Literal List Construction [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]	Baseline (None)	1.059	1.00x	0	0
	Cost Tracking	3.712	3.51x	0	0
	Memory Tracking (Sample = 1)	31.19	29.45x	0	0
	Memory Tracking (Sample = 5)	31.08	29.35x	0	0
	State Tracing	20.58	19.43x	0	0
	Cost + Memory Tracking	32.26	30.46x	0	0
	Cost Tracking + State Tracing	21.69	20.48x	0	0
	Memory Tracking + State Tracing	46.93	44.32x	0	0
	All Options Enabled	48.44	45.74x	0	0
Map Comprehension (10 elements) a.map(x, x * 2)	Baseline (None)	3,074.0	1.00x	2,315	64
	Cost Tracking	3,661.0	1.19x	2,956	84
	Memory Tracking (Sample = 1)	5,481.0	1.78x	2,316	64
	Memory Tracking (Sample = 5)	4,961.0	1.61x	2,316	64
	State Tracing	4,045.0	1.32x	2,315	64
	Cost + Memory Tracking	6,163.0	2.00x	2,958	84
	Cost Tracking + State Tracing	4,712.0	1.53x	2,956	84
	Memory Tracking + State Tracing	6,390.0	2.08x	2,316	64
	All Options Enabled	7,073.0	2.30x	2,958	84
Nested Comprehension (10 elements) a.map(x, [x, x]).filter(...)	Baseline (None)	7,397.0	1.00x	5,980	156
	Cost Tracking	8,610.0	1.16x	7,103	196
	Memory Tracking (Sample = 1)	14,447.0	1.95x	5,983	156
	Memory Tracking (Sample = 5)	12,828.0	1.73x	5,983	156
	State Tracing	10,443.0	1.41x	5,980	156
	Cost + Memory Tracking	15,533.0	2.10x	7,106	196
	Cost Tracking + State Tracing	11,847.0	1.60x	7,103	196
	Memory Tracking + State Tracing	16,818.0	2.27x	5,983	156
	All Options Enabled	20,439.0	2.76x	7,106	196
Proto Field Access msg.single_int64 + msg.single_int32	Baseline (None)	91.05	1.00x	0	0
	Cost Tracking	129.6	1.42x	32	1
	Memory Tracking (Sample = 1)	167.5	1.84x	0	0
	Memory Tracking (Sample = 5)	173.7	1.91x	0	0
	State Tracing	179.0	1.97x	0	0
	Cost + Memory Tracking	220.4	2.42x	32	1
	Cost Tracking + State Tracing	217.5	2.39x	32	1
	Memory Tracking + State Tracing	215.6	2.37x	0	0
	All Options Enabled	269.9	2.96x	32	1
Proto Repeated Comprehension (10 elements) msg.repeated_int64.map(...)	Baseline (None)	3,198.0	1.00x	2,275	55
	Cost Tracking	3,766.0	1.18x	2,916	75
	Memory Tracking (Sample = 1)	6,093.0	1.91x	2,605	67
	Memory Tracking (Sample = 5)	5,415.0	1.69x	2,605	67
	State Tracing	4,090.0	1.28x	2,363	57
	Cost + Memory Tracking	6,628.0	2.07x	3,246	87
	Cost Tracking + State Tracing	4,786.0	1.50x	3,004	77
	Memory Tracking + State Tracing	6,992.0	2.19x	2,605	67
	All Options Enabled	7,700.0	2.41x	3,246	87