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Resolves #4349
Add new TCM doc page Performing migrations
Deployment: https://docs.d.tarantool.io/en/doc/gh-4349-tcm-migrations/tooling/tcm/tcm_cluster_migrations/
Note
The description of how to write migration code to apply with the new tt mechanism (which is used by TCM under the hood) is out of this PR's scope. Will be documented in scope of #4387. Adding a simple example of a migration file as a hint.