feat: Simple cart totals calculations

[olivermrbl]

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Latest commit: cac8428eb996c6d8abb103bd4fb54c67e5ea11f0

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[adrien2p]

could you add a description and resolve the conflict please :)

[olivermrbl]

Superceded by https://github.com/medusajs/medusa/pull/6980 and https://github.com/medusajs/medusa/pull/7010