pool: chore: make reserve caching system more obvious to use #180
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There was some concern that it was not obvious and potentially error prone that developers could misuse the "reserves_to_store" component of the Pool reserve cache.
The fix was to make it more obvious the intention of a developer as they used it. I opted for this over an explicit "store unless defused" mechanism because we often read reserves we don't want to store as a final step (IE - checking the health factor in submit).
The fix requires the developer to state if they want to store the reserve when they load it, and the pool will validate that no reserve is missing from the cache that it expects to write back. This prevents the case where a developer forgets to store the updated reserve before calling
pool.store_cached_reserves
.