fix: rpc: readd rpc.discover aliases; lotus-gateway openrpc

[magik6k]

Related Issues

Fixes #8556

Proposed Changes

Re-add rpc.discover alias to the Discover method. We definitely used to have it, but it got lost somehow in one of the many api refactors.

Also add openrpc support to lotus-gateway

[codecov]

Codecov Report

Merging #8738 (b0f7faa) into master (7836e20) will increase coverage by 0.07%.
The diff coverage is 63.63%.

@@            Coverage Diff             @@
##           master    #8738      +/-   ##
==========================================
+ Coverage   40.84%   40.91%   +0.07%     
==========================================
  Files         692      692              
  Lines       76177    76188      +11     
==========================================
+ Hits        31112    31174      +62     
+ Misses      39688    39654      -34     
+ Partials     5377     5360      -17     

Impacted Files	Coverage Δ
gateway/node.go	44.71% <0.00%> (-0.44%)	⬇️
build/openrpc.go	56.25% <60.00%> (+0.69%)	⬆️
cmd/lotus-worker/sealworker/rpc.go	37.25% <100.00%> (+1.25%)	⬆️
gateway/handler.go	91.66% <100.00%> (+0.36%)	⬆️
node/rpc.go	28.57% <100.00%> (+1.15%)	⬆️
chain/events/message_cache.go	87.50% <0.00%> (-12.50%)	⬇️
chain/actors/builtin/miner/diff.go	48.52% <0.00%> (-10.30%)	⬇️
storage/wdpost_sched.go	77.45% <0.00%> (-3.93%)	⬇️
extern/sector-storage/sched_worker.go	78.23% <0.00%> (-1.18%)	⬇️
extern/sector-storage/stores/remote.go	57.76% <0.00%> (-0.44%)	⬇️
... and 18 more