go/common/grpc: Configure max message size on the client

[kostko]

No description provided.

[nhynes]

where did the 100 -> 10 MiB change go?

[codecov]

Codecov Report

Merging #4268 (bbd6709) into master (afcda58) will decrease coverage by 0.53%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #4268      +/-   ##
==========================================
- Coverage   69.22%   68.68%   -0.54%     
==========================================
  Files         410      410              
  Lines       47126    47130       +4     
==========================================
- Hits        32622    32372     -250     
- Misses      10492    10734     +242     
- Partials     4012     4024      +12     

Impacted Files	Coverage Δ
go/common/grpc/grpc.go	81.36% <100.00%> (-2.18%)	⬇️
go/ias/http/http.go	20.33% <0.00%> (-44.07%)	⬇️
go/oasis-node/cmd/common/metrics/disk.go	65.51% <0.00%> (-20.69%)	⬇️
go/keymanager/api/policy_sgx.go	33.33% <0.00%> (-13.34%)	⬇️
go/runtime/host/sandbox/sandbox.go	71.06% <0.00%> (-12.09%)	⬇️
go/common/cbor/codec.go	78.37% <0.00%> (-10.82%)	⬇️
go/keymanager/client/client.go	72.72% <0.00%> (-8.27%)	⬇️
go/oasis-node/cmd/common/metrics/resource.go	84.00% <0.00%> (-8.00%)	⬇️
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%)	⬇️
... and 33 more

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[kostko]

where did the 100 -> 10 MiB change go?

Let's consider that separately.