Implement BiBo in the CU

[TillaTheHun0]

This PR updates the CU implementation to use the new Bytes-In, Bytes-Out ao approach. This is implemented on top of the message streaming already in place in the CU.

Summary of changes to impl:

• tags are now passed to processes as the native { name, value }[] arweave tag shape. This is for both Sequenced and Scheduled Messages
• The buffer that represents the process state is persisted as an attachment on the evaluation document. The buffer is compressed using zlib
• Changes to support the new shape of the process return. Instead of { state, result: { output, messages, spawns, error } }, it is { output, messages, spawns, error }
• No longer persist the input message, as part of cached evaluation -- it is unused and just bloats persistence.

Closes #132