feat: initialize Kurdistan SDK - independent fork of Polkadot SDK

pezkuwi/roadmap/implementers-guide/src/runtime-api/candidate-events.md

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+# Candidate Events
+
+Yields a vector of events concerning candidates that occurred within the given block.
+
+```rust
+enum CandidateEvent {
+	/// This candidate receipt was backed in the most recent block.
+	CandidateBacked(CandidateReceipt, HeadData, CoreIndex, GroupIndex),
+	/// This candidate receipt was included and became a parablock at the most recent block.
+	CandidateIncluded(CandidateReceipt, HeadData, CoreIndex, GroupIndex),
+	/// This candidate receipt was not made available in time and timed out.
+	CandidateTimedOut(CandidateReceipt, HeadData, CoreIndex),
+}
+
+fn candidate_events(at: Block) -> Vec<CandidateEvent>;
+```