Prototype of event stream accumulators

[mystenmark]

• [accumulator] Support accumulator in effects v2
• Prototype: Framework support for accumulators
• Prototype: execution changes for accumulators
• Move is_system_tx() to TransactionData
• Move mock_checkpoint_builder to core
• Add Accumulator types
• Construct settlement transactions in checkpoint builder
• Tests
• Notes for Deepak

[vercel[bot]]

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