forest-cli sync wait exits too early

[lemmih]

Issue summary

The forest-cli sync wait RPC call doesn't wait until Forest has entered the follow mode. Instead, it merely waits for the completion of a single sync-range step. When syncing to a network, Forest will query the current HEAD and then initiate a sync-range from the heaviest tipset to the current HEAD. This step is then repeated until Forest has caught up. When we call forest-cli sync wait, we should wait until Forest has completely caught up rather than waiting for a single sync-range step.

Acceptance criteria:

• forest-cli sync wait guarantees that Forest is in the follow mode.

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