🧹 Move eval to TunableEvalParameters file and make it non tunable via appsettings

[eduherminio]

Related to #850

Before the revert:

Test  | cleanup/move-eval-to-separated-file-2-eval-terms
Elo   | -3.77 +- 3.79 (95%)
SPRT  | 8.0+0.08s Threads=1 Hash=32MB
LLR   | -2.29 (-2.25, 2.89) [-3.00, 1.00]
Games | 15566: +4666 -4835 =6065
Penta | [511, 1814, 3282, 1685, 491]
https://openbench.lynx-chess.com/test/521/

After:

Test  | cleanup/move-eval-to-separated-file-2-eval-terms
Elo   | -2.92 +- 3.24 (95%)
SPRT  | 8.0+0.08s Threads=1 Hash=32MB
LLR   | -2.26 (-2.25, 2.89) [-3.00, 1.00]
Games | 21144: +6378 -6556 =8210
Penta | [694, 2411, 4508, 2297, 662]
https://openbench.lynx-chess.com/test/526/

Merging anyway to keep everything in the same file, at least temporarily