test-runner: Read runtime version from fixture

[matevz]

Fixes #4343:

• adds version field of type version.Version to runtime fixture and config structs
• fixes converting versions from uint64, if component values are greater than 255

[codecov]

Codecov Report

Merging #4357 (2f39499) into master (3b30b54) will increase coverage by 0.06%.
The diff coverage is n/a.

❗ Current head 2f39499 differs from pull request most recent head f668a0f. Consider uploading reports for the commit f668a0f to get more accurate results

@@            Coverage Diff             @@
##           master    #4357      +/-   ##
==========================================
+ Coverage   68.61%   68.68%   +0.06%     
==========================================
  Files         411      411              
  Lines       47431    47431              
==========================================
+ Hits        32543    32576      +33     
+ Misses      10840    10822      -18     
+ Partials     4048     4033      -15     

Impacted Files	Coverage Δ
go/storage/api/root_cache.go	79.16% <0.00%> (-4.17%)	⬇️
go/worker/keymanager/handler.go	67.92% <0.00%> (-3.78%)	⬇️
go/keymanager/client/client.go	75.20% <0.00%> (-3.31%)	⬇️
...consensus/tendermint/apps/roothash/transactions.go	63.88% <0.00%> (-3.25%)	⬇️
go/consensus/tendermint/apps/beacon/state/state.go	72.97% <0.00%> (-2.71%)	⬇️
go/runtime/host/protocol/connection.go	66.79% <0.00%> (-2.32%)	⬇️
go/oasis-node/cmd/stake/delegations.go	78.99% <0.00%> (-1.69%)	⬇️
go/runtime/nodes/grpc/grpc.go	72.35% <0.00%> (-1.37%)	⬇️
go/worker/common/committee/group.go	82.39% <0.00%> (-0.75%)	⬇️
go/runtime/client/submitter.go	65.29% <0.00%> (-0.59%)	⬇️
... and 17 more

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