Introduce pawn structure based history

Original idea by Seer chess engine https://github.com/connormcmonigle/seer-nnue,
coding done by @Disservin, code refactoring done by @locutus2 to match the style
of other histories.

This patch introduces pawn structure based history, which assings moves values
based on last digits of pawn structure hash and piece type of moved piece and
landing square of the move. Idea is that good places for pieces are quite often
determined by pawn structure of position. Used in 3 different places
- sorting of quiet moves, sorting of quiet check evasions and in history based
pruning in search.

Passed STC:
https://tests.stockfishchess.org/tests/view/65391d08cc309ae83955dbaf
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 155488 W: 39408 L: 38913 D: 77167
Ptnml(0-2): 500, 18427, 39408, 18896, 513

Passed LTC:
https://tests.stockfishchess.org/tests/view/653a36a2cc309ae83955f181
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 70110 W: 17548 L: 17155 D: 35407
Ptnml(0-2): 33, 7859, 18889, 8230, 44

closes https://github.com/official-stockfish/Stockfish/pull/4849

Bench: 1257882

Co-Authored-By: Disservin <disservin.social@gmail.com>
Co-Authored-By: Stefan Geschwentner <locutus2@users.noreply.github.com>

src/position.h

@@ -39,6 +39,7 @@ struct StateInfo {
 
     // Copied when making a move
     Key    materialKey;
+    Key    pawnKey;
     Value  nonPawnMaterial[COLOR_NB];
     int    castlingRights;
     int    rule50;
@@ -146,6 +147,7 @@ class Position {
     Key key() const;
     Key key_after(Move m) const;
     Key material_key() const;
+    Key pawn_key() const;
 
     // Other properties of the position
     Color   side_to_move() const;
@@ -293,6 +295,8 @@ inline Key Position::adjust_key50(Key k) const {
     return st->rule50 < 14 - AfterMove ? k : k ^ make_key((st->rule50 - (14 - AfterMove)) / 8);
 }
 
+inline Key Position::pawn_key() const { return st->pawnKey; }
+
 inline Key Position::material_key() const { return st->materialKey; }
 
 inline Value Position::non_pawn_material(Color c) const { return st->nonPawnMaterial[c]; }