`config auto` improvements

[AlianBenabdallah]

Summary

#2533 Introduces a new command to automatically generate a config file. This issue lists some possible improvements.

TODO :

• [ ] Estimate gas parameters. The command currently uses hardcoded values. (P-high)
• [x] Read data from the latest valid commit. The command currently reads from a specific commit (P-high)
• [ ] Add a cache (P-low)
• [ ] Check the config file's correctness after being created (or just ask user to perform config validate ?)

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For Admin Use

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