Faster Devnet Startup

[saralab]

This task will require some R&D and is likely to contain unknown unknowns. But here is what we hope to achieve

• block height zero: 8 seconds → 1 second
  booting the Stacks and Bitcoin nodes
• epoch 3.0: 2 minutes → a few seconds
  by saving the Docker volumes of previous devnet session

With a better control of the Docker volumes, it should be possible to speed up the initial deployment (seconds instead of minutes).
Note: the durations don’t account for docker images downloading

The substantive changes proposed:

• project .cache/ is populated with contents from ~/.clarinet/cache (up to epoch 3 block)
• generate global cache from running a project. This will probably not be used because Ideally we'd like to bundle the cache data in, but it could be useful later as a custom snapshotting feature down the road.
• bitcoin starts from correct cached block

[tippenein]

Currently working off feat/devnet-cache. The state of feature completeness is:

• project .cache/ is populated with contents from ~/.clarinet/cache (up to epoch 3 block)
• generate global cache from running a project. This will probably not be used because Ideally we'd like to bundle the cache data in, but it could be useful later as a custom snapshotting feature down the road.
• bitcoin starts from correct cached block
• stacks/signer accept the starting point from bitcoin
• flag for opting out of cache
• manifest checking/warning if incompatible with cache

Right now the bitcoin cache is working correctly

however, the stacks node is not accepting the cache OR it's still looking for a genesis block.