Basic light client CLI

[gdanezis]

Description

This PR adds a new command line utility that:

• Syncs to all end-of-epoch checkpoints found either on a given list or by binary search (less efficient)
• Check that a TID in a checkpoint sequence number is valid, based on checking committee certificates on the checkpoint, and print the effects digest.
• Prints all events in a TID or the objects with OID
• Checks that all types are correct by checking the transactions that created the modules are correct.

Test Plan

How did you test the new or updated feature?

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If your changes are not user-facing and not a breaking change, you can skip the following section. Otherwise, please indicate what changed, and then add to the Release Notes section as highlighted during the release process.

Type of Change (Check all that apply)

• [ ] protocol change
• [x] user-visible impact
• [ ] breaking change for a client SDKs
• [ ] breaking change for FNs (FN binary must upgrade)
• [ ] breaking change for validators or node operators (must upgrade binaries)
• [ ] breaking change for on-chain data layout
• [ ] necessitate either a data wipe or data migration

Release notes

Added a basic light client to cryptographically check outcomes of transactions without a full node.

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