go/common/sgx/pcs: Add support for PCS v4 and TCB info v3

[peternose]

curl -v "https://api.trustedservices.intel.com/sgx/certification/v4/tcb?fmspc={00606A000000}"
curl -v "https://api.trustedservices.intel.com/sgx/certification/v4/qe/identity"

[codecov]

Codecov Report

Merging #5108 (487a1cd) into master (0315a47) will increase coverage by 0.11%.
The diff coverage is 18.18%.

@@            Coverage Diff             @@
##           master    #5108      +/-   ##
==========================================
+ Coverage   66.79%   66.91%   +0.11%     
==========================================
  Files         497      497              
  Lines       53135    53127       -8     
==========================================
+ Hits        35491    35548      +57     
+ Misses      13320    13248      -72     
- Partials     4324     4331       +7     

Impacted Files	Coverage Δ
go/common/sgx/common.go	69.90% <ø> (+3.88%)	⬆️
go/common/sgx/pcs/http.go	14.70% <ø> (ø)
go/common/sgx/pcs/quote.go	55.70% <14.28%> (-0.97%)	⬇️
go/common/sgx/pcs/tcb.go	50.40% <25.00%> (-3.59%)	⬇️
go/roothash/api/api.go	80.35% <0.00%> (-5.36%)	⬇️
go/worker/beacon/tx_retry.go	90.47% <0.00%> (-4.77%)	⬇️
go/storage/mkvs/lookup.go	75.00% <0.00%> (-4.17%)	⬇️
go/consensus/tendermint/full/services.go	74.81% <0.00%> (-3.71%)	⬇️
go/oasis-node/cmd/ias/auth_registry.go	65.81% <0.00%> (-2.57%)	⬇️
...nsensus/tendermint/apps/keymanager/transactions.go	48.78% <0.00%> (-2.44%)	⬇️
... and 23 more

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.