Proto commits in chiselstrike/chiselstore

These 4 commits are when the Protocol Buffers files have changed:

Commit:aecef72
Author:Pekka Enberg

Move ChiselStore code to `core` crate Let's make some room for additional crates.

The documentation is generated from this commit.

Commit:0143e0d
Author:Pekka Enberg
Committer:Pekka Enberg

Add consistency to query RPC

Commit:3dcf857
Author:Pekka Enberg

Move Protobuf definitions to top-level

Commit:75fc3a9
Author:Pekka Enberg
Committer:Pekka Enberg

Initial commit