Add a document describing a safe API for Tock 2.0's Subscribe syscall.#340

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jrvanwhy wants to merge 3 commits intotock:masterfrom jrvanwhy:subscribe-api-design

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Commits on Oct 28, 2021

Commits on Oct 29, 2021

Fix the safety invariant on kernel_subscribe and state that Yield is used to invoke callbacks.
jrvanwhy
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