Add config file for development environment

[jk-gan]

Summary

Previously the development environment and production environment share the same config file path, this cause a lot of confusion even for me. This PR adds a config file path for the development environment (~/.config/wukong/dev/config.toml). Running wukong without prod features, which only happens during development, will use the development environment config file.

Ticket:

What's Changed

Added

• add config file for development environment

Changed

• replace lazy_static crate with once_cell crate since Rust will include once_cell API in the future. Replace lazy_static with once_cell clap-rs/clap#3828

[sauron-droid]

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This pull-request has been approved by: jk-gan, onimsha

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