Move rkyv RPC support to use CRC32 checksums rather than checkbytes and use stack allocated scratch.
#186
| Job | Run time |
|---|---|
| 2m 26s | |
| 3m 18s | |
| 4m 40s | |
| 5m 14s | |
| 8m 23s | |
| 9m 25s | |
| 33m 26s |