test(tm2/pkg/cmap): add benchmarks to show true impact of contention

[odeke-em]

The Go standard library's sync.Map is touted as great for cases with high load and is commonly known knowledge but the benchmark that I am committing shows otherwise that for this library's usage, it is so much more expensive hence this benchmark will avoid someone committing sync.Map without seeing the true implications.

$ benchstat map_w_mutex.txt stdlib_sync_map.txt
name                               old time/op    new time/op    delta
CMapConcurrentInsertsDeletesHas-8     1.72s ±11%     1.92s ± 3%   +11.66%  (p=0.000 n=10+9)
CMapHas-8                             109ns ± 9%     118ns ± 3%    +8.26%  (p=0.002 n=10+8)

name                               old alloc/op   new alloc/op   delta
CMapConcurrentInsertsDeletesHas-8    1.18GB ± 2%    3.21GB ± 3%  +172.09%  (p=0.000 n=10+10)
CMapHas-8                             16.0B ± 0%     16.0B ± 0%      ~     (all equal)

name                               old allocs/op  new allocs/op  delta
CMapConcurrentInsertsDeletesHas-8      824k ± 0%     4433k ± 0%  +437.89%  (p=0.000 n=10+10)
CMapHas-8                              2.00 ± 0%      1.60 ±38%      ~     (p=0.065 n=9+10)

Updates #3505

[Gno2D2]

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