2.8 release notes (opensearch-project#946) (opensearch-project#1252)

Signed-off-by: Jing Zhang <jngz@amazon.com>
Co-authored-by: Jing Zhang <jngz@amazon.com>

Author: zane-neo

release-notes/opensearch-ml-common.release-notes-2.8.0.0.md

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+## Version 2.8.0.0 Release Notes
+
+Compatible with OpenSearch 2.8.0
+
+### Experimental Features
+
+* Model access control. ([#928](https://github.com/opensearch-project/ml-commons/pull/928))
+
+### Enhancements
+
+* Add a setting to enable/disable model url in register API ([#871](https://github.com/opensearch-project/ml-commons/pull/871))
+* Add a setting to enable/disable local upload while registering model ([#873](https://github.com/opensearch-project/ml-commons/pull/873))
+* Check hash value for the pretrained models ([#878](https://github.com/opensearch-project/ml-commons/pull/878))
+* Add pre-trained model list ([#883](https://github.com/opensearch-project/ml-commons/pull/883))
+* Add content hash value for the correlation model. ([#885](https://github.com/opensearch-project/ml-commons/pull/885))
+* Set default access_control_enabled setting to false ([#935](https://github.com/opensearch-project/ml-commons/pull/935))
+* Enable model access control in secure reset IT ([#940](https://github.com/opensearch-project/ml-commons/pull/940))
+* Add model group rest ITs ([#942](https://github.com/opensearch-project/ml-commons/pull/942))
+
+### Bug Fixes
+
+* Fix class not found exception when deserialize model ([#899](https://github.com/opensearch-project/ml-commons/pull/899))
+* Fix publish shadow publication dependency issue ([#919](https://github.com/opensearch-project/ml-commons/pull/919))
+* Fix model group index not existing model version query issue and SecureMLRestIT failure ITs ([#933](https://github.com/opensearch-project/ml-commons/pull/933))
+* Fix model access mode upper case bug ([#937](https://github.com/opensearch-project/ml-commons/pull/937))
+
+### Documentation
+
+
+### Maintenance
+
+* Increment version to 2.8.0-SNAPSHOT ([#896](https://github.com/opensearch-project/ml-commons/pull/896))
+
+### Refactoring
+
+* Change mem_size_estimation to memory_size_estimation ([#868](https://github.com/opensearch-project/ml-commons/pull/868))