[devkit/cli-v2] Add convert subcommand

[Tinna23]

Convert fee data between CSV and JSON formats.

Usage: devkit convert --file fees.csv --from csv --to json --output fees.json

Files to touch:

• packages/devkit/src/cli/mod.rs
• packages/devkit/src/utilities/csv_reader.rs
• packages/devkit/src/utilities/json_reader.rs

[Userhorlie]

@Userhorlie has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

hello there i would love to take on this issue

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[dara0097]

@dara0097 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

hello there i would love to take on this issue

ℹ️ Repo Maintainers: To accept this application, review their application or assign @dara0097 to this issue.