WAL sync checkpointing support #1928
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This patch adds support for checkpointing during WAL sync, which allows
us to sync multiple checkpoint generations from the server.
The protocol is as follows:
1. A client uses the pull endpoint to fetch frames.
2. When we reach the end of a generation, the server returns "I am a teapot"
(yes, really) with a JSON containing the maximum generation number on the
server.
3. If we need to pull more generations, we first checkpoint the WAL on the
client, and then continue pulling frames from the newer generation.
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This pull request adds WAL sync checkpointing support.