⚡ Force GC collection at the end of Engine constructor and after ucinewgame

[eduherminio]

Tested using:

ucinewgame
go depth 15
go depth 15
ucinewgame
ucinewgame

Before:

After:

NPS looking good in bench

Test  | perf/force-gc-after-newgame
Elo   | -0.55 +- 2.73 (95%)
SPRT  | 4.0+0.04s Threads=1 Hash=32MB
LLR   | -2.27 (-2.25, 2.89) [0.00, 3.00]
Games | N: 40842 W: 13403 L: 13468 D: 13971
Penta | [1818, 4392, 8026, 4407, 1778]
https://openbench.lynx-chess.com/test/203/

> python .\sprt.py -w 13403 -d 13971 -l 13468 -e0 -5 -e1 0
ELO: -0.553 +- 2.73 [-3.28, 2.18]
LLR: 3.76 [-5.0, 0.0] (-2.94, 2.94)
H1 Accepted