Merge all the separate solana crates into a single workspace. This is the same thing we do for terra and will make it easier to check / lint / test all the crates together.
Change-Id: I9c1ce5f25b21ca81599957a7faa730558d8fc03e
Change-Id: I9bf5255c13b13d3724d7f8809489b04612b90747
Change-Id: Ide97a1df9d55658eeea79f7886a3a504a9108fda