airdrop: High memory usage

[hexfusion]

We found in Ci that the use of airdrop[1] functionality would oom nodes due to high memory usage. This issue is to track the perf issue and possibly correct so that we can re-enable in Ci.

[1]

spacesvm/chain/genesis.go

Line 134 in 1ad8376

func (g *Genesis) Load(db database.Database, airdropData []byte) error {

ref. #131