runtime: Use Namespace for runtime id, validate block namespace

[kostko]

• runtime: Remove common::runtime::RuntimeId

  The Go API has been using Namespace for a while so this makes it
  consistent in the Rust runtime as well.

• runtime: Validate block namespace against runtime ID

[codecov]

Codecov Report

Merging #3633 (d724832) into master (ef294fb) will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3633      +/-   ##
==========================================
- Coverage   67.36%   67.33%   -0.03%     
==========================================
  Files         390      390              
  Lines       36676    36676              
==========================================
- Hits        24706    24696      -10     
- Misses       8523     8531       +8     
- Partials     3447     3449       +2     

Impacted Files	Coverage Δ
go/consensus/tendermint/full/services.go	81.35% <0.00%> (-4.24%)	⬇️
go/runtime/host/protocol/connection.go	57.55% <0.00%> (-4.09%)	⬇️
go/worker/keymanager/worker.go	61.06% <0.00%> (-2.81%)	⬇️
go/consensus/tendermint/apps/registry/genesis.go	39.80% <0.00%> (-1.95%)	⬇️
go/runtime/nodes/versioned.go	75.23% <0.00%> (-1.91%)	⬇️
go/worker/common/committee/runtime_host.go	64.28% <0.00%> (-1.79%)	⬇️
go/runtime/client/watcher.go	62.96% <0.00%> (-1.49%)	⬇️
.../consensus/tendermint/apps/registry/state/state.go	57.75% <0.00%> (-1.33%)	⬇️
go/consensus/api/grpc.go	69.27% <0.00%> (-1.16%)	⬇️
go/registry/api/api.go	49.20% <0.00%> (-1.07%)	⬇️
... and 22 more

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