Add function to activate license

Follow the docs https://docs.cryptlex.com/node-locked-licenses/using-lexactivator/using-lexactivator-with-python

Read the linked LexActivator Python documentation first, then inspect the repository's existing entry points to find where license operations belong. The issue names no target file or test, so identify the relevant API surface and existing test conventions before starting. Done means the requested license-activation function follows the documented flow and is exposed through the project API.

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