added seller statistic feature

[Jovz19200]

what does PR do?

• adding the seller statistics feature

[railway-app]

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 47.22222% with 19 lines in your changes missing coverage. Please review.

Project coverage is 72.17%. Comparing base (ba8fd4e) to head (7d054ed).

Files	Patch %	Lines
src/controllers/statsController.ts	16.66%	10 Missing ⚠️
src/services/stats.service.ts	30.76%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #100      +/-   ##
==========================================
- Coverage   72.71%   72.17%   -0.54%     
==========================================
  Files         130      134       +4     
  Lines        2415     2451      +36     
  Branches      316      313       -3     
==========================================
+ Hits         1756     1769      +13     
- Misses        639      682      +43     
+ Partials       20        0      -20     

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[yvanddniyo]

LGTM

[MugemaneBertin2001]

LGTM