LoadedPrograms cache implementation and tests #30139
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Problem
Need facility to cache programs across active forks based on their deployment/updates.
Summary of Changes
This PR adds a new cache
LoadedPrograms. The cache maintains multiple versions of loaded programs based on the active forks, and program's deployment/update slot. When the root slot is updated, the unreachable forks can be pruned from the cache.This PR adds the framework for cache, and associated unit tests. More changes are needed in bank, accounts and surrounding code to integrate it in the flow.
Fixes #