Add changelog entry

changelog.d/20241206_184906_roman_cli_hierarchy.md

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+### Added
+
+- \[CLI\] Added new commands: `project create`, `project delete`, `project ls`
+  (<https://github.com/cvat-ai/cvat/pull/8787>)
+
+- \[SDK\] You can now use `client.projects.remove_by_ids` to remove multiple
+  projects
+  (<https://github.com/cvat-ai/cvat/pull/8787>)
+
+### Changed
+
+- \[CLI\] Switched to a new subcommand hierarchy; now CLI subcommands
+  have the form `cvat-cli <resource> <action>`
+  (<https://github.com/cvat-ai/cvat/pull/8787>)
+
+### Deprecated
+
+- \[CLI\] All existing CLI commands of the form `cvat-cli <action>`
+  are now deprecated. Use `cvat-cli task <action>` instead
+  (<https://github.com/cvat-ai/cvat/pull/8787>)