enum checks

[matevz]

PR for #2527:

• adds KindInvalid to RuntimeKind enum,
• adds KindInvalid to CommitteeKind enum,
• adds ContextInvalid to ContextType enum,
• adds HeaderInvalid to HeaderType enum,
• adds Invalid to artifactType enum both in go and rust,
• in CommitteeKind enum renames KindExecutor -> KindComputeExecutor, KindTransactionScheduler -> KindComputeTxnScheduler, and KindMerge -> KindComputeMerge.

[codecov]

Codecov Report

Merging #2546 into master will increase coverage by 3.47%.
The diff coverage is 30%.

@@            Coverage Diff             @@
##           master    #2546      +/-   ##
==========================================
+ Coverage   63.55%   67.02%   +3.47%     
==========================================
  Files         347      330      -17     
  Lines       32397    30573    -1824     
==========================================
- Hits        20589    20491      -98     
+ Misses       9261     7534    -1727     
- Partials     2547     2548       +1

Impacted Files	Coverage Δ
go/scheduler/api/api.go	88% <ø> (ø)	⬆️
go/registry/api/runtime.go	36.36% <0%> (-2.35%)	⬇️
go/oasis-node/cmd/registry/runtime/runtime.go	57.6% <0%> (-0.43%)	⬇️
go/registry/tests/tester.go	88.21% <100%> (+0.07%)	⬆️
go/consensus/tendermint/apps/registry/genesis.go	53.04% <100%> (ø)	⬆️
go/worker/storage/service_internal.go	0% <0%> (-53.34%)	⬇️
go/worker/storage/api/grpc.go	20% <0%> (-22.86%)	⬇️
go/worker/keymanager/service.go	55.55% <0%> (-22.23%)	⬇️
go/worker/storage/service_external.go	47.61% <0%> (-9.53%)	⬇️
go/consensus/tendermint/keymanager/keymanager.go	79.22% <0%> (-6.5%)	⬇️
... and 78 more

---

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[codecov-io]

Codecov Report

Merging #2546 into master will increase coverage by 0.36%.
The diff coverage is 77.55%.

@@            Coverage Diff             @@
##           master    #2546      +/-   ##
==========================================
+ Coverage   63.28%   63.65%   +0.36%     
==========================================
  Files         346      346              
  Lines       32545    32585      +40     
==========================================
+ Hits        20597    20741     +144     
+ Misses       9391     9266     -125     
- Partials     2557     2578      +21

Impacted Files	Coverage Δ
go/consensus/tendermint/abci/context.go	79.85% <ø> (ø)	⬆️
go/common/version/version.go	84% <ø> (ø)	⬆️
go/roothash/api/block/header.go	72.97% <ø> (ø)	⬆️
go/registry/api/runtime.go	37.5% <0%> (-1.21%)	⬇️
go/oasis-node/cmd/registry/runtime/runtime.go	57.6% <0%> (-0.43%)	⬇️
go/runtime/transaction/transaction.go	77.1% <0%> (+0.27%)	⬆️
go/consensus/tendermint/apps/registry/genesis.go	53.04% <100%> (ø)	⬆️
go/registry/tests/tester.go	88.05% <100%> (+0.01%)	⬆️
go/runtime/client/watcher.go	75.86% <100%> (ø)	⬆️
go/consensus/tendermint/apps/roothash/roothash.go	72.56% <100%> (ø)	⬆️
... and 26 more

---

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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