CHANGELOG: add it, release 1.0.0-rc.8

Signed-off-by: Roman Khimov <roman@nspcc.ru>

CHANGELOG.md

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+# Changelog
+
+## [1.0.0-rc.8] - 2023-04-27
+
+We've reworked the way we handle keys in the SDK and added an experimental API
+simplifying object creation. Pools were also improved and a number of other
+minor enhancements are included in this release as well. Try it in your
+applications and leave your feedback in issues, we need it to make 1.0.0 a
+really good release for all NeoFS use cases.
+
+New features:
+ * object/relations package for large (splitted) object data handling (#360, #348)
+ * pool can now accept stream operations timeout parameter (#364)
+ * pool can also accept callbacks to be invoked after every client response (#365)
+ * additional marshaling/unmarshaling methods for accounting.Decimal,
+   netmap.NetworkInfo and version.Version (#378)
+ * it's possible to get a single client from a pool now (#388)
+ * object.SearchFilters now provide more convenient APIs to search for object
+   by their hashes (#386)
+ * experimental client-side API for object creation (and slicing large inputs
+   into split objects, #382)
+
+Behaviour changes:
+ * ns.ResolveContainerName changed to ns.ResolveContainerName with more
+   specific input type (#356)
+ * pool.ErrPoolClientUnhealthy is no longer exported (#358)
+ * deprecated object.RawObject type is gone (#387)
+ * pools no longer use default session tokens for read operations (they're not
+   required technically, #363)
+ * Go 1.18+ is required now (#394)
+ * enumeration types in eacl and object packages now have
+   EncodeToString/DecodeString methods replacing String/FromString for
+   serialization; String is still available, but it's not guaranteed to be
+   compatible across versions (#393)
+ * signing APIs no longer require a specific key, it can be provided in a
+   Signer wrapper (with different schemes) or a crypto.StaticSigner can be
+   used for signatures calculated outside of the SDK (#398, #401)
+ * (NetMap).PlacementVectors and (NetMap).ContainerNodes APIs now use more
+   specific types simplifying their use (#396)
+
+Improvements:
+ * pool can work with some nodes being inaccessible now (#358)
+ * unified error messages in the client/status package (#369)
+ * documentation updates (#370, #392, #396)
+ * updated NeoGo, ANTLR, zap, golang-lru dependencies (#372)
+ * (*Client).ContainerSetEACL method now checks CID internally before
+   generating a request to send to the network (#389)
+ * neofs-api-go signature package is no longer required (#401)
+
+Bugs fixed:
+ * pool.DeleteObject now correctly handles large (splitted) objects (#360)
+ * object structure problems are no longer considered as connection problems
+   by the pool (#374)
+ * private key used as a part of a map key in the pool (#401)
+
+## pre-v1.0.0-rc.8
+
+See git log.
+
+[1.0.0-rc.8]: https://github.com/nspcc-dev/neofs-sdk-go/compare/v1.0.0-rc.7...v1.0.0-rc.8