[Clarity VM] Contract AST is stored as plain-text JSON

[cylewitruk]

Clarity contract AST's are atm stored as plain-text JSON in the Clarity DB (chainstate/vm/clarity/marf.sqlite). The current average AST storage size is 7kb over 78.5k contracts (my dataset is about a month old). We could either use compression, or opt for a more compact and performant binary format (such as MessagePack or PerfBuf) and reduce both the storage requirements and (de)serialization speeds dramatically.

Not prio atm, so creating this as a placeholder.

[blockstack-devops]

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