Add a CLI argument to `redbot` to add cog paths to `[p]paths`

[cswimr]

Type of feature request

Other

Description of the feature you're suggesting

I propose a --cog-paths flag for the redbot CLI. This flag would add a colon-separated list of cog paths to [p]paths, and would not persist through restarts (just like other CLI flags).

Example usage:
--cog-paths /workspaces/FooCogs:/workspaces/BarCogs

Anything else?

So, for some context, I develop my cogs for Red inside of a Dev Container. Here's what that looks like. Then, I use Visual Studio Code's Run & Debug feature to actually run Red. The initial setup process for this development environment is as follows:

• Run redbot-setup
• Launch Red through the Run & Debug menu
• Once the bot is started, run [p]addpath /workspaces/SeaCogs inside of Discord to add the project directory to the bot as a cog path.
  • This step is what would be improved by this feature request.

If this feature request is implemented, I could add --cog-paths /workspaces/SeaCogs to my VSCode Run & Debug configuration, removing one initial setup step to get up and running.

Discussed in the Red Discord Server, in #feature-ideas: https://discord.com/channels/133049272517001216/133049878837329920/1332807433650704534

[Flame442]

I would prefer if this was called --cog-path or similar, and behaved similar to --co-owner where it could be passed multiple times to add multiple paths.