simulate: blockstore-based backtest to support forked replay

[nipatel-jump]

New Simulate Subcommand and Feccap

The simulate subcommand provides a specialized environment similar to backtest using captured live data. It replays FEC sets from persistent storage previously captured shred information by a new feccap tile.

• Minimal Topology: Uses only essential tiles (simulate, snap, replay, exec, writer, tower)
• Replay for Forks: Allows for testing over forks, and interleaved execution

Known Issues

Not being backpressured because of problems that exist in the replay tile due to TOCTOU conditions.
Fixed by Ishan: a916c48

[github-actions]

Performance Measurements ⏳

Suite	Baseline	New	Change
backtest mainnet-368528500-perf per slot	0.099851 s	0.096787 s	-3.069% ✅
backtest mainnet-368528500-perf snapshot load	3 s	2.9 s	-3.333% ✅
backtest mainnet-368528500-perf total elapsed	99.851332 s	96.7871 s	-3.069% ✅
firedancer mem usage with mainnet.toml	1008.12 GiB	1008.12 GiB	0.000% ✅

[github-actions]

Performance Measurements ⏳

Suite	Baseline	New	Change
backtest mainnet-368528500-perf per slot	0.101841 s	0.099041 s	-2.749% ✅
backtest mainnet-368528500-perf snapshot load	2.9 s	2.9 s	0.000% ✅
backtest mainnet-368528500-perf total elapsed	101.840655 s	99.041349 s	-2.749% ✅
firedancer mem usage with mainnet.toml	1008.12 GiB	1008.12 GiB	0.000% ✅

[github-actions]

Performance Measurements ⏳

Suite	Baseline	New	Change
backtest mainnet-368528500-perf per slot	0.099399 s	0.099407 s	0.008% ✅
backtest mainnet-368528500-perf snapshot load	3 s	2.9 s	-3.333% ✅
backtest mainnet-368528500-perf total elapsed	99.398881 s	99.406841 s	0.008% ✅
firedancer mem usage with mainnet.toml	1008.12 GiB	1008.12 GiB	0.000% ✅