FEN string to bitboards

[nymann]

Rationale

In the API we want to easily lookup a position in our database, the user provides us with a FEN string and in order to speed up query performance we filter by bitboards

Implementation

Given a FEN string compute the following bit boards:

{

    "fen": "string",
    "bitboard_all": 0,
    "bitboard_white": 0,
    "bitboard_black": 0,
    "bitboard_white_pawn": 0,
    "bitboard_black_pawn": 0,
    "bitboard_white_rook": 0,
    "bitboard_black_rook": 0,
    "bitboard_white_knight": 0,
    "bitboard_black_knight": 0,
    "bitboard_white_bishop": 0,
    "bitboard_black_bishop": 0,
    "bitboard_white_queen": 0,
    "bitboard_black_queen": 0,
    "bitboard_white_king": 0,
    "bitboard_black_king": 0

}

This needs to be relative fast, since we are computing it for each API request to GET /positions/{fen} POST /positions/

Cython maybe an idea here?