Update project to latest shim-protos and ttrpc using protobuf 3.x

[jsturtevant]

In preparation for adding windows #49 which is built using latest ttrpc libraries which use protobuf 3, this PR updates the project to use latest dependencies and moves the protocols to using protobuf 3.

note: There isn't a release of the shim-protos project with these changes yet so it pins a rev. I am going to open an issue on https://github.com/containerd/rust-extensions/ to see if we can get a release (or maybe wait till the windows changes propagate up). Opened this up to show required changes which allow for using Windows.

[jsturtevant]

This is taking much longer than anticipated, things are moving along but slowly. I am finding it difficult to maintain this patch and work on the Windows implementation with the various changes going in for the youki work.

Any thoughts on pinning to a rev vs a realse so we can start bumping the other dependencies and moving forward on protobuf 3?

[devigned]

This is taking much longer than anticipated, things are moving along but slowly. I am finding it difficult to maintain this patch and work on the Windows implementation with the various changes going in for the youki work.

Any thoughts on pinning to a rev vs a realse so we can start bumping the other dependencies and moving forward on protobuf 3?

I'm good with pinning to a rev as long as we have an issue to track the follow up work. What do others think?

[jsturtevant]

/cc @cpuguy83 @devigned @Mossaka @ipuustin

[jsturtevant]

I'm good with pinning to a rev as long as we have an issue to track the follow up work. What do others think?

I've refreshed the PR and opened #162 to track updating getting this on a release