Add optional hie_bios output group to haskell_repl

[aherrmann]

This allows users to configure hie-bios to use these outputs to determine GHC flags. See #1262 (WIP) for an example setup with ghcide.

• Factors out the common flags for ghci and hie-bios in the haskell_repl implementation.
• Factors out the GHC flags required to configure cc_wrapper to avoid duplication.
• Creates an output group for haskell_repl that produces a file holding all relevant ghci flags for that target. (Excludes flags that are ghci specific, e.g. repl_ghci_args or flags required for -ghci-script)

A downside of this approach, compared to e.g. hrepl, is that haskell_repl targets are not generated on-the-fly but have to be defined in BUILD files. However, this is a general limitation of haskell_repl.

[cocreature]

Nice, thank you!