Make current beacon status available via the CLI

[Yawning]

• Expose all the beacon things needed via gRPC
• Add the query commands
• Deal with getting bikeshedded over the output format
• Be terrorized by github actions and buildkite

Fixes #3897

[codecov]

Codecov Report

Merging #3999 (1e1b863) into master (2e939b2) will increase coverage by 0.12%.
The diff coverage is 7.40%.

❗ Current head 1e1b863 differs from pull request most recent head 26cad5b. Consider uploading reports for the commit 26cad5b to get more accurate results

@@            Coverage Diff             @@
##           master    #3999      +/-   ##
==========================================
+ Coverage   66.94%   67.07%   +0.12%     
==========================================
  Files         411      411              
  Lines       42178    42107      -71     
==========================================
+ Hits        28238    28242       +4     
+ Misses       9929     9877      -52     
+ Partials     4011     3988      -23     

Impacted Files	Coverage Δ
go/beacon/api/grpc.go	17.31% <0.00%> (-2.18%)	⬇️
go/beacon/api/pvss.go	80.00% <ø> (ø)
go/worker/beacon/worker.go	47.92% <16.66%> (-0.68%)	⬇️
go/consensus/tendermint/beacon/beacon.go	70.43% <100.00%> (ø)
go/runtime/host/helpers.go	60.97% <0.00%> (-6.38%)	⬇️
go/storage/api/root_cache.go	80.00% <0.00%> (-4.45%)	⬇️
go/keymanager/client/client.go	76.31% <0.00%> (-3.51%)	⬇️
go/consensus/tendermint/apps/beacon/state/state.go	68.25% <0.00%> (-3.18%)	⬇️
go/oasis-node/cmd/common/common.go	48.78% <0.00%> (-1.63%)	⬇️
go/runtime/nodes/grpc/grpc.go	71.93% <0.00%> (-1.59%)	⬇️
... and 32 more

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