added changelogs

Author: coot

dmq-node/changelog.d/20251016_142205_coot_dmq_signature_validation.md

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+
+### Breaking
+
+- Using `KESPeriod` from `Cardano.Crypto.KES` instead of `SigKESPeriod`
+  newtype.  `KESPeriod` is used by `SigRaw` data type.
+- `SigKESSignature` holds `SigKES (KES crypto)` instead of a `ByteString`.
+- `SigColdKey` holds `VerKeyDSIGN` instead of a `ByteString`.
+- `ntnApps` constraints changed in order to use `sigValidate` function.
+
+### Non-Breaking
+
+- `Sig` codec decodes KES signatures, and the cold key.
+- Added `DMQ.SigSubmission.Type.validateSig` and `SigValidationError`.
+