feat(signals): provide Dispatcher and Events at the platform level

[markostanimirovic]

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[timdeschryver]

After approving, I was wondering if this could lead to a breaking change when someone bootstraps 2 applications?

[markostanimirovic]

As we talked, breaking changes are not expected since bootstrapping multiple apps on the same page would be a rare case. Even though they happen, the Events plugin is still experimental, and we want to enable its use in the platform-level SignalStores.