[source-lemlist] Add new columns for AB tests tracking

[tlfbrito]

Add new columns (stepTested and sequenceTested)

API documentation: https://developer.lemlist.com/#get-activities

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[CLAassistant]

All committers have signed the CLA.

[tlfbrito]

Can you bump the metadata version and the changelog entry in docs?

Thanks for the review @marcosmarxm

[marcosmarxm]

Running tests 🚀 ⌛