Remove colon syntax from --dep

[fadeev]

Currently, to scaffold a module with a dependency on another module you have to do the following:

ignite scaffold module foo --dep bank

This works for bank, but doesn't for feegrant, because it's it's trying to find FeegrantKeeper and fails. What it needs is FeeGrantKeeper (notice the G). Ignite has an ugly solution that works:

ignite scaffold module foo --dep feegrant:FeeGrantKeeper

I propose we remove the colon syntax for --dep and ask users to provide dependencies in a capitalized form (--dep FeeGrant). We can also capitalize the first letter for convenience, so --dep bank would also work (but --dep feegrant wouldn't).

Context: #2776

[jeronimoalbi]

I still have the feeling it's not quite user friendly as the possible formats are not instantly clear. I added FeeGrant to the flag help because of that reason.