feat(examples): Implement commit-reveal mechanism for Shifumi game to enhance fairness

[linhpn99]

Description

From #2758

This PR introduces a commit-reveal mechanism for the Shifumi game, ensuring players' moves are hidden until both have committed. The off-chain hashing process is required to prevent move visibility before reveal.

Contributors' checklist...

• Added new tests, or not needed, or not feasible
• Provided an example (e.g. screenshot) to aid review or the PR is self-explanatory
• Updated the official documentation or not needed
• No breaking changes were made, or a BREAKING CHANGE: xxx message was included in the description
• Added references to related issues and PRs
• Provided any useful hints for running manual tests
• Added new benchmarks to generated graphs, if any. More info here.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.43%. Comparing base (f04ec89) to head (2bef372).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2760      +/-   ##
==========================================
- Coverage   60.44%   60.43%   -0.01%     
==========================================
  Files         563      563              
  Lines       75159    75159              
==========================================
- Hits        45427    45423       -4     
- Misses      26343    26346       +3     
- Partials     3389     3390       +1     

Flag	Coverage Δ
contribs/gnodev	61.46% <ø> (ø)
contribs/gnofaucet	14.46% <ø> (-0.86%)	⬇️
gno.land	67.21% <ø> (ø)
gnovm	64.46% <ø> (ø)
misc/genstd	80.54% <ø> (ø)
misc/logos	19.88% <ø> (ø)
tm2	62.05% <ø> (ø)

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[leohhhn]

@linhpn99 Thanks!

How does a user generate a commit? It would be great to explain this to the user, as it's integral to playing the game.

[linhpn99]

@linhpn99 Thanks!

How does a user generate a commit? It would be great to explain this to the user, as it's integral to playing the game.

yeah i update Render function to clarify how the game works
basically, it still requires hashing to be done off-chain, and I haven't yet figured out how to make it more convenient for players except for linking to a Go Playground source containing a hash function to calculate the commit

[leohhhn]

#2333 (comment)