For #2483, add regression test for RTC stat API

[winlinvip]

No description provided.

[codecov-commenter]

Codecov Report

Merging #2486 (586c08f) into 4.0release (86c67f7) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@              Coverage Diff               @@
##           4.0release    #2486      +/-   ##
==============================================
- Coverage       42.86%   42.86%   -0.01%     
==============================================
  Files             102      102              
  Lines           35883    35883              
==============================================
- Hits            15383    15382       -1     
- Misses          20500    20501       +1     

| Impacted Files | Coverage Δ | |'

Translated to English while maintaining the markdown structure:

'| Impacted Files | Coverage Δ | |
|---|---|---|
| trunk/src/protocol/srs_service_utility.cpp | 72.43% <0.00%> (-0.55%) | ⬇️ |

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Translated to English while maintaining the markdown structure:

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TRANS_BY_GPT3

[duiniuluantanqin]

approved