Add rewind support

[andystaples]

Adds rewind support to durabletask.
Requires the following changes:

1. Add rewind action to protobuf: Adding a Rewind Action durabletask-protobuf#65
2. Add rewind support to the DTS sidecar: https://msazure.visualstudio.com/One/_git/AAPT-DTMB/pullrequest/14935863
3. Add rewind action support to DTS

Resolves #68