[1] Run Real Transaction Test for PGSQL

[wskozlowski]

see design, implement test, run on AWS Aurora instance - single Python client process with K = 100k, 1M, 10M and N = 1, 2, 8, 32

https://docs.google.com/document/d/1Kiu28E6niKwJQu9U4yZPXzIHN7cPEeRXqBGodk_oSRM/edit?tab=t.0#bookmark=kix.akqz6y5rqu10

[adrian-zawadzki]

1 - 2 GB: https://docs.google.com/spreadsheets/d/1dD4NR0Jy7Q0tP_ocPRwo1TEIpwrl3ByuidZoer55CBQ/edit?usp=sharing
1 -16 GB: https://docs.google.com/spreadsheets/d/1RZmSkUV1NPQkkPGrk1Po5j1sera68_cbBb-a-QekdO8/edit?usp=sharing