Migrated urunc from containerd v1.x to v2.x for fixing unparsed new flag

[Cicada1107]

The issue:

• I checked all the major changes across v1.x and v2.x containerd
• First, I tried to look at just the sed file and patch it however, in doing so I realized that it is not really a sed issue. The changes introduced in containerd v2.x were not really a sed issue.
• The root cause of the -info parsing issue was that containerd v2.x daemon expects the shim to parse the new flags like -info which the older containerd v1.x shim implementation did not support (and this is the shim we were using under the hood in our containerd-shim-urunc-v2 as seen in the main.go file of the same)
• So, the solution was to migrate urunc from containerd v1 to v2.
• This had the following issues:
  • The path is different for v2. Its github.com/containerd/containerd/v2 instead of github.com/containerd/containerd.
  • The shim manager was relocated from github.com/containerd/containerd/runtime/v2/runc/manager in v1 to github.com/containerd/containerd/v2/cmd/containerd-shim-runc-v2/manager in v2.
  • The task plugin and the api were relocated and also had changes:
    • Task plugin was relocated from in runtime/v2/runc/task v1 to cmd/containerd-shim-runc-v2/task in v2.
    • The NewTaskService constructor signature was chnaged from taking a *plugin.InitContext to taking a (context.Context, shim.Publisher, shutdown.Service).
  • Also, the grpc APIs are now separated out completely into a different path - github.com/containerd/containerd/api .
• And here's why the sed command in the Makefile was breaking I think: it modifies the vendor/github.com/containerd/go-runc/runc.go but when migrating to v2, the sed command isnt itself wrong, but the files it compiles - cmd/containerd-shim-urunc-v2/main.go - our urunc shim, relied on the old runtime/v2/runc paths which don't exit anymore in containerd v2.

The changes I made:

• Updated the depenencies to use containerd v2 instead of v1, and the required supporting changes. Basically:

go get [github.com/containerd/containerd/v2@v2.3.1](https://github.com/containerd/containerd/v2@v2.3.1)
go get [github.com/containerd/containerd/api@v1.11.1](https://github.com/containerd/containerd/api@v1.11.1)
go mod tidy
go mod vendor

and then all the below changes are mostly mitigating the breaking changes this migration would cause as I listed above.

• Updated the makefile to use the updated module structure for making the build
• Updated the shim manager imports in containerd-shim-urunc-v2/main.go to the new paths and to use the shim.RunShim as per the new v2 instead of shim.RunManager API as described above & (This is important: please let me know if this change is fine!) made an intercption hook before executing shim.RunShim (Because v2 container shim outputs a binary protobuf instead of normal string like v1 shim did, so I was getting errors like "Yunix Schemas" and other misinterpretations, so this wrapper basically takes it and converts the protobuf into a oplaintext string like before. This should take care of backward compatibility).
• Updated containerd-shim/task_plugin.go to use the new paths and the new fn signature, again, as described above.
• Containerd v2 also changed the mapping for errors nad plugins. So migrated task_plugin.go and task_service.go accordingly - to use the new namespace definitions (github.com/containerd/containerd/v2/plugins) and also, swapped out deprecated errdefs.FromGRPC for the errgrpc.ToNative and errgrpc.ToGRPCF functions as per the new standard.
• Searched and replaced all the outdated imports with the new paths across a few other files.

Result:

• Tested by starting up the same qemu unikernel command that gave me the -info error before, on containerd v2.3.1
• Got no "level=error flag = -info not parsed...." in journalctl logs
• I've tried hard to be careful with everything, but do let me know if there is something that I should look into or modify

Fixes #750

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