x/gov: Submit Proposal via File

[alexanderbez]

Summary

I believe it would improve the UX of the CLI for submitting proposals if users were allowed to submit them via an optional file instead of direct flags.

Problem Definition

It can be cumbersome to provide such information (especially the description) directly via the command line.

Proposal

e.g.

$ gaiacli gov submit-proposal --from=<keyName> ... --proposal|file|proposal-file

If such a flag is given, the file should be read and the other flags should be ignored (or nice error returned) if given, then parsed, and the remaining logic should be the same.

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[cwgoes]

ACK, excellent idea.

Note: I think the @ prefix is often used for reading from files, and might save us an extra CLI flag, e.g. --proposal "I am a potato" vs --proposal @potato.txt.

[alexanderbez]

Yeah curl does this huh? Good idea 👍