Trace blocks to file

[endale98]

This pull request introduces a new feature for tracing Ethereum blocks and saving the trace output to files. The changes include adding a new command-line flag, updating configurations, and implementing methods to handle block tracing and file output. Below are the most important changes grouped by theme:

Command-line Flag and Configuration Updates:

• Added a new trace-outdir flag (utils.TraceOutdirFlag) to specify the directory for saving trace outputs. This flag is integrated into the CLI in cmd/tomo/main.go and defined in cmd/utils/flags.go. [1] [2]
• Updated the SetEthConfig function in cmd/utils/flags.go to handle the trace-outdir flag, including setting the directory path, creating the folder if it doesn’t exist, and logging the output path.
• Added a new global variable StoreTraceFolder in common/constants.go to store the directory path for trace outputs.

Block Tracing Feature:

• Implemented a new method StandardTraceBlocksToFile in eth/api_tracer.go to trace multiple blocks and save the outputs as JSON files in the specified directory.
• Added a helper method standardTraceBlockToFile in eth/api_tracer.go to handle tracing for individual blocks, encoding the results as JSON, and writing them to files.

Web3 API Extension:

• Added a new Web3 method standardTraceBlocksToFile in internal/web3ext/web3ext.go to expose the block tracing functionality via the Web3 API.