changelog: Add Change Log fragments for issues/pull requests since 19.0

.changelog/2377.removal.md

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+Remove staking-related roothash messages.
+
+There is no longer a plan to support direct manipulation of the staking accounts
+from the runtimes in order to isolate the runtimes from corrupting the
+consensus layer.
+
+To reduce complexity, the staking-related roothash messages were removed. The
+general roothash message mechanism stayed as-is since it may be useful in the
+future, but any commits with non-empty messages are rejected for now.

.changelog/2435.feature.md

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+Add `oasis-node unsafe-reset` sub-command which resets the node back to a
+freshly provisioned state, preserving any key material if it exists.

.changelog/2482.feature.md

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+Add consensus block and transaction metadata accessors.
+
+In order to enable people to build "network explorers", we exposed some
+additional methods via the consensus API endpoint, specifically:
+
+- Consensus block metadata.
+- Access to raw consensus transactions within a block.
+- Stream of consensus blocks as they are finalized.

.changelog/2492.removal.md

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+Remove `oasis-node debug dummy` sub-commands.
+
+These are only useful for testing, and our test harness has a internal Go API
+that removes the need to have this functionality exposed as a sub-command.