Add dryrun transaction API

[platfowner]

Change summary:

• Add ain_dryrunSignedTransaction json rpc API
• Update transfer tool for dryrun
• Add test for dryrun transaction API
• Simplify db restoring logic

Related issues:

• https://github.com/ainblockchain/ain-blockchain/issues/1182

[platfowner]

Dryrun json rpc method name was changed to ain_sendSignedTransactionDryrun.

PTAL~ @shyun-comcom

[shyun-comcom]

Function createAndExecuteTransaction calls executeAndBroadcastTransaction. Is there no need to set the isDryrun flag here?

[platfowner]

Function createAndExecuteTransaction calls executeAndBroadcastTransaction. Is there no need to set the isDryrun flag here?

createAndExecuteTransaction is for creating transactions for Dev Client SET APIs. Here are some context:

• Dev Client SET APIs are used for testing and development purposes and being disabled in testnet and mainnet deployment
• We have some plan to deprecate Dev Client SET APIs once all the test cases are migrated to json rpc APIs (there so many tests cases and it will take some time)
• Currently isDryrun = true option is available for json rpc API ain_sendSignedTransactionDryrun only

[platfowner]

Thanks for the review! Now merging.. @shyun-comcom