[VL] Add output row metric for InputIteratorTransformer

[Yohahaha]

What changes were proposed in this pull request?

After this patch, we can check average row count of a vector.

How was this patch tested?

[github-actions]

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https://github.com/oap-project/gluten/issues

Then could you also rename commit message and pull request title in the following format?

[GLUTEN-${ISSUES_ID}][COMPONENT]feat/fix: ${detailed message}

See also:

• Other pull requests

[GlutenPerfBot]

===== Performance report for TPCH SF2000 with Velox backend, for reference only ====

query	log/native_3939_time.csv	log/native_master_12_05_2023_a46243420_time.csv	difference	percentage
q1	33.86	34.72	0.858	102.53%
q2	26.16	25.00	-1.153	95.59%
q3	37.80	37.98	0.178	100.47%
q4	38.86	38.25	-0.610	98.43%
q5	72.25	72.06	-0.192	99.73%
q6	7.17	5.37	-1.801	74.87%
q7	85.82	82.30	-3.523	95.89%
q8	87.63	86.96	-0.679	99.22%
q9	125.91	126.92	1.014	100.81%
q10	45.62	45.43	-0.195	99.57%
q11	20.26	20.31	0.043	100.21%
q12	26.47	27.02	0.550	102.08%
q13	45.78	47.15	1.367	102.99%
q14	16.42	19.01	2.585	115.74%
q15	27.54	29.59	2.044	107.42%
q16	15.74	15.81	0.073	100.46%
q17	102.48	103.87	1.392	101.36%
q18	151.02	150.70	-0.322	99.79%
q19	14.35	14.53	0.173	101.21%
q20	27.32	28.18	0.862	103.16%
q21	221.36	223.72	2.358	101.07%
q22	13.03	13.17	0.140	101.07%
total	1242.88	1248.05	5.165	100.42%