restore: snapwm and multiple snapwr (vinyl)

[jvarela-jump]

Two architectural optimizations to the snapshot load pipeline under vinyl:

1. snapin tile is split into two:

• snapin handles parsing and bstream pair generation.

• snapwm handles vinyl meta_map and bstream allocation.

  With this change: snapin->snapwm->snapwh->snapwr.

2. The topology now supports multiple snapwr tiles, and snapwh handles multiple fseq accordingly.

• the number of snapwr tiles is configurable from the toml.

The measured speedup is around ~1.6x.

[github-actions]

Performance Measurements ⏳

Suite	Baseline	New	Change
backtest mainnet-368528500-perf per slot	0.050439 s	0.050729 s	0.575% ✅
backtest mainnet-368528500-perf snapshot load	1.627 s	1.649 s	1.352% ✅
backtest mainnet-368528500-perf total elapsed	50.438584 s	50.728887 s	0.576% ✅
firedancer mem usage with mainnet.toml	1005.23 GiB	1005.23 GiB	0.000% ✅