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This commit introduces `AccessControl` capabilities to Karma. The reason this is done so that there can be multiple actors in the system with different privileges. The main changes done here are: - Introduce internal functions for most of the `Karma` specific logic (this is necessary to allow properly extending the contract's functionality via modifiers) later on - Inherit AccessControlUpgradeable contract - Introduce OPERATOR_ROLE next to the already provided DEFAULT_ADMIN_ROLE This is an alternative solution to the PR in #209. Instead of providing an upgrade version, this commit is a breaking change as it introduces a storage layout conflict. BREAKING CHANGE This commit introduces a storage layout conflict. Redeployment required. Closes #207