runtime/consensus/tendermint/verifier: Refactor verifier

[peternose]

Refactor verifier to group verify/update time/update block operations
Also consider splitting the tendermint/verifier into multiple modules as it is getting quite large.

[codecov]

Codecov Report

Merging #4934 (c7a7ea5) into master (06012a8) will increase coverage by 0.13%.
The diff coverage is 70.39%.

@@            Coverage Diff             @@
##           master    #4934      +/-   ##
==========================================
+ Coverage   66.64%   66.78%   +0.13%     
==========================================
  Files         464      464              
  Lines       51204    51221      +17     
==========================================
+ Hits        34127    34207      +80     
+ Misses      12891    12828      -63     
  Partials     4186     4186              

Impacted Files	Coverage Δ
go/common/version/version.go	80.26% <ø> (ø)
go/consensus/tendermint/apps/roothash/api.go	100.00% <ø> (ø)
go/keymanager/api/api.go	80.64% <0.00%> (ø)
go/registry/api/api.go	57.46% <0.00%> (ø)
go/runtime/host/protocol/types.go	54.54% <ø> (ø)
go/runtime/host/sgx/ecdsa.go	7.29% <0.00%> (-0.41%)	⬇️
go/worker/common/committee/runtime_host.go	83.33% <ø> (+27.77%)	⬆️
go/worker/keymanager/worker.go	64.85% <ø> (-1.10%)	⬇️
go/common/node/sgx.go	75.22% <51.28%> (-12.62%)	⬇️
go/runtime/registry/host.go	69.93% <63.63%> (+0.41%)	⬆️
... and 58 more

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[kostko]

Seems strange that the store (LRU light block store) was left out of the verifier module as it is only used by the verifier. It should probably be moved there. But there is now also a different kind of store (the trust root store) in the verifier::store module.