Add IKernel/IMessagingClient/IReliableChannelManager/ILogosDelivery interface
classes under logos_delivery/api/. The EventBroker types PR#3975 hoisted into
these files already exist in PR#3989's decomposed */api/events/ modules, so the
interface files re-export those modules instead of redefining the types
(avoids 8 duplicate EventBroker definitions). api/types.nim kept at the
foundation version (ChannelId stays in channels/types.nim, which the decomposed
modules import).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
* Move waku.nim from waku/factory to under waku/
* remove unused
* Realize Kernel API in scope of Waku class
* Refactor waku/api into messaging_client, waku/api/types and api_conf into logos_delivery/api
* Make liblogosdelivery and wakunode2 compile, remove waku/api.nim as it was just a import orchestrator
* make test compile and run
* Reconcile master's new send tests to LogosDelivery API after rebase
master commits #3965/#3669-followup added two test cases (Edge lightpush
delivery #3847, store-validation timeout) written against the removed
waku/api.nim createNode helper. Rewrite them to the LogosDelivery shape:
createNode -> LogosDelivery.new, node.node -> node.waku.node,
node.brokerCtx -> node.waku.brokerCtx, node.send -> node.messagingClient.send,
and drop the now-implicit mountMessagingClient calls (LogosDelivery.new
mounts the client internally).
