`cabal init` may use `common` stanza when choosing "Library and Executable" and version 2.2 or higher.

Currently, a generated cabal file would look something like this:

cabal-version: 2.4
-- Initial package description 'x2.cabal' generated by 'cabal init'. For
-- further documentation, see http://haskell.org/cabal/users-guide/

name: x2
...

library
-- exposed-modules:
-- other-modules:
-- other-extensions:
build-depends: base ^>=4.12.0.0
hs-source-dirs: src
default-language: Haskell2010

executable x2
main-is: Main.hs
-- other-modules:
-- other-extensions:
build-depends: base ^>=4.12.0.0
hs-source-dirs: src
default-language: Haskell2010

Surely `build-depends`, `hs-source-dirs` and `default-language` could be moved to a common stanza?

Inspect the `cabal init` generation path, focusing on the Library and Executable selection for cabal-version 2.2 or higher. Compare the generated sections with the issue's example; done means shared `build-depends`, `hs-source-dirs`, and `default-language` settings are emitted through a `common` stanza.

Written by the indexing model from the issue text.