fixes official-stockfish#2106

This PR switches from cutechess-cli to fast-chess.

cutechess-cli has been serving us well in the past years, however, some issues
have accumulated, namely the difficulty of compiling cutechess-cli, the
observed timeouts at high concurrency and short TC, and e.g. slowness when
indexing larger books.  fast-chess https://github.com/Disservin/fast-chess has
addressed these issues, and has now probably become mature enough to serve as
the game manager for fishtest.

As an example of its ability to deal with short TC and high concurrency:
https://dfts-0.pigazzini.it/tests/view/669249cdbee8253775cede32
with concurrency 25, and TC 1+0.01s no timeouts are observed.

fast-chess is built from sources, with the zip download as well as the binary
cached as needed.  There is fine-grained control over which version of
fast-chess is used, so we can easily upgrade for new features.

In this PR, fast-chess is built in cutechess compatibility to facilitate
integration, and to benefit from the existing fishtest checks. Once validated,
we should be able to switch easily to its native mode, which can output
trinomial and pentanomial results, and we should be able significantly simplify
the worker's book-keeping.

Co-Authored-By: Disservin <[email protected]>
Co-Authored-By: Gahtan Nahdi <[email protected]>

Fully switch to 'native' fast-chess output, its pentanomial and wld output for
every game pair simplies the worker code a lot.