V2 DataFeeds1 SDK (#1352) * initial * bump version * remove anchor-lang dependency * use anchor 0.29.0 just for tests * stay on v3 lockfile * version * pin solana-program * add deps * bump solana-program * bump again * pin * try 2.3.0 * downgrade solana-program * lint * tidy up * lint * seperately build sdk * add new test * fix hashfiles