add additional methods to lotus gateway

[travisperson]

Added methods

• ChainGetParentMessages
• ChainGetParentReceipts
• ChainGetGenesis

[codecov]

Codecov Report

Merging #7644 (17aa758) into master (7a9824f) will decrease coverage by 0.90%.
The diff coverage is 0.00%.

❗ Current head 17aa758 differs from pull request most recent head 17cb511. Consider uploading reports for the commit 17cb511 to get more accurate results

@@            Coverage Diff             @@
##           master    #7644      +/-   ##
==========================================
- Coverage   40.61%   39.70%   -0.91%     
==========================================
  Files         479      633     +154     
  Lines       49824    67269   +17445     
==========================================
+ Hits        20235    26709    +6474     
- Misses      25861    35956   +10095     
- Partials     3728     4604     +876     

Impacted Files	Coverage Δ
gateway/node.go	46.03% <0.00%> (ø)
extern/sector-storage/manager_calltracker.go	57.70% <0.00%> (-4.85%)	⬇️
api/api_full.go	47.36% <0.00%> (ø)
cmd/lotus-miner/config.go	0.00% <0.00%> (ø)
cmd/lotus-sim/simulation/stages/util.go	0.00% <0.00%> (ø)
cmd/lotus-sim/simulation/mock/mock.go	0.00% <0.00%> (ø)
cmd/lotus-miner/init_service.go	0.00% <0.00%> (ø)
cmd/lotus-sim/simulation/simulation.go	0.00% <0.00%> (ø)
cmd/lotus-miner/pieces.go	0.00% <0.00%> (ø)
... and 354 more

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