runtime/consensus/verifier: Support trust root consensus layer upgrades

[peternose]

Tested locally. Without changes compute workers are stuck with error messages Consensus verifier failed to initialize.

{"err":"builder: I/O error\n\nCaused by:\n   0: rpc error\n   1: server error: module: consensus code: 3 message: consensus: version not found\n, ...}

With changes compute workers report error message Not enough trust to accept new chain context when there is not enough trust to do the transition

{"level":"info","log_event":"consensus/tendermint/verifier/chain_context/no_trust","module":"runtime/consensus/tendermint/verifier","msg":"Not enough trust to accept new chain context","runtime_id":"8000000000000000000000000000000000000000000000000000000000000000","runtime_name":"test-runtime","tally":"VotingPowerTally { total: 3, tallied: 2, trust_threshold: TrustThresholdFraction { numerator: 2, denominator: 3 } }","ts":"2022-08-24T04:30:43.604572699Z"}

or Failed to accept new chain context if new light blocks are invalid (e.g. invalid time, height, hash, ...).

{"error":"NonIncreasingHeight(NonIncreasingHeightSubdetail { got: block::Height(46), expected: block::Height(51) })","level":"info","log_event":"consensus/tendermint/verifier/chain_context/failed","module":"runtime/consensus/tendermint/verifier","msg":"Failed to accept new chain context","runtime_id":"8000000000000000000000000000000000000000000000000000000000000000","runtime_name":"test-runtime","ts":"2022-08-24T04:29:42.405580653Z"}

[codecov]

Codecov Report

Merging #4903 (dbdd00f) into master (5a149fc) will increase coverage by 0.10%.
The diff coverage is 71.42%.

❗ Current head dbdd00f differs from pull request most recent head c77ee97. Consider uploading reports for the commit c77ee97 to get more accurate results

@@            Coverage Diff             @@
##           master    #4903      +/-   ##
==========================================
+ Coverage   66.60%   66.70%   +0.10%     
==========================================
  Files         464      464              
  Lines       50981    50984       +3     
==========================================
+ Hits        33955    34011      +56     
+ Misses      12834    12795      -39     
+ Partials     4192     4178      -14     

Impacted Files	Coverage Δ
go/runtime/host/protocol/types.go	54.54% <ø> (ø)
go/runtime/registry/host.go	75.10% <71.42%> (+6.09%)	⬆️
...onsensus/tendermint/apps/beacon/state/state_vrf.go	73.33% <0.00%> (-13.34%)	⬇️
go/worker/common/committee/p2p.go	70.00% <0.00%> (-6.67%)	⬇️
go/worker/common/p2p/dispatch.go	71.52% <0.00%> (-5.56%)	⬇️
go/genesis/api/api.go	68.42% <0.00%> (-5.50%)	⬇️
go/worker/beacon/tx_retry.go	90.47% <0.00%> (-4.77%)	⬇️
.../worker/compute/executor/committee/transactions.go	86.36% <0.00%> (-4.55%)	⬇️
go/common/sgx/common.go	66.01% <0.00%> (-3.89%)	⬇️
go/consensus/tendermint/full/light.go	59.25% <0.00%> (-3.71%)	⬇️
... and 31 more

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[kostko]

Looks nice, thanks! Just one minor thing that could maybe be changed.

[kostko]

Could also introduce the GetGenesisBlock method to the consensus backend.