separate commands, eg: `fp-ts-codegen: Expand Selection as literal encoding`

[betafcc]

• fp-ts-codegen: Expand Selection as literal encoding
• fp-ts-codegen: Expand Selection as fp-ts encoding

Instead of forcing the use of settings for this, since I'm usually switching. Maybe expand to these command:

• fp-ts-codegen: Expand using settings
• fp-ts-codegen: Expand as literal encoding, positional handlers
• fp-ts-codegen: Expand as literal encoding, record handlers
• fp-ts-codegen: Expand as fp-ts encoding, positional handlers
• fp-ts-codegen: Expand as fp-ts encoding, record handlers