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Napkin math shows that we can save substantial memory (~3x or more) on the API nodes as connected clients/gateways grow if we just store the fields we need in order to keep the client and gateway state maintained in the channel pids. To facilitate this, we create new `Cacheable` structs that represent their `Domain` cousins, which use byte arrays for `id`s and strip out unused fields. Additionally, all business logic involved with maintaining these caches is now contained within two modules: `Domain.Cache.Client` and `Domain.Cache.Gateway`, and type specs have been added to aid in static analysis and code documentation. Comprehensive testing is now added not only for the cache modules, but for their associated channel modules as well to ensure we handle different kinds of edge cases gracefully. The `Events` nomenclature was renamed to `Changes` to better name what we are doing: Change-Data-Capture. Lastly, the following related changes are included in this PR since they were "in the way" so to speak of getting this done: - We save the last received LSN in each channel and drop the `change` with a warning if we receive it twice in a row, or we receive it out of order - The client/gateway version compatibility calculations have been moved to `Domain.Resources` and `Domain.Gateways` and have been simplified to make them easier to understand and maintain going forward. Related: #10174 Fixes: #9392 Fixes: #9965 Fixes: #9501 Fixes: #10227 --------- Signed-off-by: Jamil <jamilbk@users.noreply.github.com> Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>