[CPU] Add script for benchmark average counters aggregation

[EgorDuplensky]

Example output:

Node type	Count	Sum (ms)	%
FullyConnected	197	77.812	91.77
ScaledDotProductAttentionWithKVCache	28	3.7	4.36
RoPE	56	0.687	0.81
Reorder	161	0.473	0.56
Multiply	31	0.443	0.52
Transpose	56	0.431	0.51
PowerStatic	115	0.313	0.37
Add	59	0.227	0.27
ReduceMean	57	0.15	0.18
ReadValue	56	0.134	0.16
Reshape	200	0.114	0.13
Broadcast	6	0.092	0.11
Convert	8	0.092	0.11
Ceiling	2	0.029	0.03
Select	2	0.022	0.03
Concat	6	0.019	0.02
Gather	6	0.015	0.02
Unsqueeze	2	0.01	0.01
Clamp	2	0.009	0.01
Range	1	0.009	0.01
Less	1	0.005	0.01
Abs	1	0.004	0
ShapeOf	3	0.004	0
Constant	745	0	0
Assign	56	0	0
Parameter	4	0	0
Result	1	0	0
Total	1862	84.794	100

[dmitry-gorokhov]

Sounds like such aggregation should be part of benchmark_app itself. However I don't mind to have it in our tools.