go/backends: return pointers in GetEvents methods

[ptrus]

No description provided.

[codecov]

Codecov Report

Merging #3092 into master will decrease coverage by 0.05%.
The diff coverage is 78.29%.

@@            Coverage Diff             @@
##           master    #3092      +/-   ##
==========================================
- Coverage   68.48%   68.43%   -0.06%     
==========================================
  Files         372      372              
  Lines       36734    36812      +78     
==========================================
+ Hits        25156    25191      +35     
- Misses       8346     8376      +30     
- Partials     3232     3245      +13     

Impacted Files	Coverage Δ
go/consensus/tendermint/tendermint.go	65.13% <0.00%> (-0.44%)	⬇️
go/registry/api/api.go	41.65% <ø> (ø)
go/roothash/api/api.go	75.00% <ø> (ø)
go/staking/api/api.go	72.72% <68.00%> (-1.40%)	⬇️
go/staking/api/commission.go	95.58% <80.64%> (-3.09%)	⬇️
go/consensus/tendermint/registry/registry.go	76.11% <100.00%> (ø)
go/consensus/tendermint/roothash/roothash.go	64.02% <100.00%> (+2.33%)	⬆️
go/consensus/tendermint/staking/staking.go	68.63% <100.00%> (ø)
go/oasis-node/cmd/stake/account.go	57.21% <100.00%> (-0.23%)	⬇️
go/registry/api/grpc.go	36.08% <100.00%> (ø)
... and 38 more

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