Add deinline timing diagnostics

[prozacchiwawa]

Summary

• add opt-in deinline timing diagnostics written as TSV output in the current working directory
• track function cache hits and misses to report cache hit percentage per deinline pass
• keep skipped/no-helper rows available via an explicit diagnostics env var while keeping workflow output focused on active deinline work
• enable diagnostics in the Chia Gaming workflow and print a compact slow-pass summary
• persist function-cache entries under .chialisp/function-cache/ using a sha256tree hash of the function cache key in each filename
• include compile settings in function cache keys so persisted entries do not cross dialect/module-phase boundaries
• update function-cache tests for disk persistence and explicit setup for the new counters

Testing

• cargo fmt --all
• cargo test codegen_funcache -- --nocapture
• cargo test diskcache -- --nocapture
• cargo clippy --workspace -- -D warnings
• CHIALISP_DEINLINE_DIAGNOSTICS=deinline-two-program.tsv CHIALISP_DEINLINE_DIAGNOSTICS_SKIPPED=1 cargo test test_two_program_import_include -- --nocapture
• Targeted Chia Gaming calpoker rebuild benchmark, after prebuilding Rust with CHIALISP_NOCOMPILE=1 and limiting chialisp.toml to calpoker-generate and calpoker-generate-v1:
  • cold rebuild with empty .chialisp: real 2002.01s, diagnostics aggregate hit rate 51.63%
  • warm rebuild preserving only .chialisp/function-cache: real 1892.07s, diagnostics aggregate hit rate 81.62%
  • warm rebuild preserving all .chialisp cache data: real 47.60s