runtime: Make storage cache capacity configurable

[kostko]

No description provided.

[codecov]

Codecov Report

Merging #4264 (53bb7dd) into master (5809106) will decrease coverage by 0.57%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4264      +/-   ##
==========================================
- Coverage   69.22%   68.64%   -0.58%     
==========================================
  Files         408      408              
  Lines       47055    47055              
==========================================
- Hits        32572    32300     -272     
- Misses      10488    10738     +250     
- Partials     3995     4017      +22     

Impacted Files	Coverage Δ
go/ias/http/http.go	20.33% <0.00%> (-44.07%)	⬇️
go/worker/compute/executor/committee/batch.go	69.23% <0.00%> (-15.39%)	⬇️
go/keymanager/api/policy_sgx.go	33.33% <0.00%> (-13.34%)	⬇️
go/runtime/host/sandbox/sandbox.go	71.06% <0.00%> (-10.63%)	⬇️
go/consensus/tendermint/abci/state/state.go	61.53% <0.00%> (-7.70%)	⬇️
go/oasis-node/cmd/ias/auth.go	68.96% <0.00%> (-6.90%)	⬇️
go/common/sgx/aesm/aesm.go	63.63% <0.00%> (-6.37%)	⬇️
go/runtime/host/protocol/connection.go	66.02% <0.00%> (-6.18%)	⬇️
go/keymanager/client/client.go	72.72% <0.00%> (-4.96%)	⬇️
go/worker/storage/service_external.go	55.95% <0.00%> (-4.77%)	⬇️
... and 31 more

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