Add more to the uci eval command output

[Saphereye]

Previously only the nnue evaluation was printed

With this PR something like this should come

$ ./target/release/reckless
eval
 NNUE derived piece values:
+-------+-------+-------+-------+-------+-------+-------+-------+
|   r   |   n   |   b   |   q   |   k   |   b   |   n   |   r   |
|-12.68 |-12.77 |-12.71 |-16.47 |       |-13.02 |-12.44 |-12.09 |
+-------+-------+-------+-------+-------+-------+-------+-------+
|   p   |   p   |   p   |   p   |   p   |   p   |   p   |   p   |
| -2.62 | -3.95 | -4.28 | -5.88 | -5.50 | -5.56 | -5.14 | -2.96 |
+-------+-------+-------+-------+-------+-------+-------+-------+
|       |       |       |       |       |       |       |       |
|       |       |       |       |       |       |       |       |
+-------+-------+-------+-------+-------+-------+-------+-------+
|       |       |       |       |       |       |       |       |
|       |       |       |       |       |       |       |       |
+-------+-------+-------+-------+-------+-------+-------+-------+
|       |       |       |       |       |       |       |       |
|       |       |       |       |       |       |       |       |
+-------+-------+-------+-------+-------+-------+-------+-------+
|       |       |       |       |       |       |       |       |
|       |       |       |       |       |       |       |       |
+-------+-------+-------+-------+-------+-------+-------+-------+
|   P   |   P   |   P   |   P   |   P   |   P   |   P   |   P   |
| +2.74 | +4.03 | +4.28 | +5.71 | +5.60 | +5.37 | +5.06 | +3.15 |
+-------+-------+-------+-------+-------+-------+-------+-------+
|   R   |   N   |   B   |   Q   |   K   |   B   |   N   |   R   |
|+10.06 |+10.17 |+10.40 |+14.83 |       |+10.51 |+10.05 | +9.83 |
+-------+-------+-------+-------+-------+-------+-------+-------+

 NNUE network contributions (White side)
+------------+------------+
|   Bucket   |   Total    |
+------------+------------+
|  0         |   +2.20    |
|  1         |   +0.50    |
|  2         |   +2.21    |
|  3         |   +1.37    |
|  4         |   +1.18    |
|  5         |   +0.98    |
|  6         |   +0.92    |
|  7         |   +0.94    | <-- this bucket is used
+------------+------------+

NNUE evaluation        +0.94 (white side)

For the first table the values are calculated like so:

1. Full NNUE forward pass on the current position.
2. Remove the piece and create a copy of the board without that piece.
3. Run another full forward pass on the modified board.
4. Contribution = baseline - without.

For the second table:

1. For each bucket (0-7) run the forward pass using the buckets weights
2. Add an arrow to show which bucket is used