indexer-common: network pauses exit message

[hopeyen]

Early exit message on contract calls to the network

Resolve #207

[tilacog]

Tested the indexer-agent locally and it works as expected.

Similar errors are still around some contract calls, like this call to stableCoin.decimals():

indexer/packages/indexer-agent/src/cost.ts

Line 83 in 8c80615

const decimals = await stableCoin.decimals()

But I believe it can be worked in future PRs.