Implement new loadtest case

[jcortejoso]

Description

Add to celotool a new case for simulate-client command that emulates the load produced by ordinals/inscription scenario. That is:

• Self native-token (celo) transfers
• 0 value
• Transaction data of inscriptions type (i.e.: data:,{"p":"cls-20","op":"mint","tick":"cels","amt":"100000000"})

Additionally to that, I added a few changes to help with the testing:

• Fauceting threads accounts automatically (the accounts used to faucet must be fauceted using the command bin/celotooljs.sh generate faucet-load-test --mnemonic $MNEMONIC --replica_from 0 --replica_to 10 --threads_from 0 --threads_to 0 -e <NETWORK> --gold 50 --dollars 50)
• Adding chainId to txOptions
• Unify the logic to derive the account index using getIndexForLoadTestThread function.