hadrian/hie-bios: pass -j to hadrian

This commit passes -j to hadrian in the hadrian/hie-bios scripts. When
the user starts HLS in a fresh clone that has just been configured, it
takes quite a while for hie-bios to pick up the ghc flags and start
actual indexing, due to the fact that the hadrian build step defaulted
to -j1, so -j speeds things up and improve HLS user experience in GHC.
Also add -j flag to .ghcid to speed up ghcid, and sets the Windows
build root to .hie-bios which also works and unifies with other
platforms, the previous build root _hie-bios was missing from
.gitignore anyway.

.ghcid

---command sh ./hadrian/ghci
+--command sh -c "HADRIAN_ARGS=-j ./hadrian/ghci -j"
 --reload compiler
 --reload ghc
 --reload includes

hadrian/hie-bios

@@ -3,5 +3,4 @@
 # When run, this program will output a list of arguments which are necessary to
 # load the GHC library component into GHCi. The program is used by `ghcide` in
 # order to automatically set up the correct GHC API session for a project.
-TERM=dumb CABFLAGS=-v0 TOOL_OUTPUT=$HIE_BIOS_OUTPUT $PWD/hadrian/build-cabal tool:$1 -q --build-root=.hie-bios --flavour=ghc-in-ghci
-
+TERM=dumb CABFLAGS=-v0 TOOL_OUTPUT=$HIE_BIOS_OUTPUT $PWD/hadrian/build-cabal tool:$1 -q --build-root=.hie-bios --flavour=ghc-in-ghci -j

hadrian/hie-bios.bat

 set TERM=dumb
 set CABFLAGS=-v0
 set TOOL_OUTPUT=%HIE_BIOS_OUTPUT%
-%CD%\hadrian\build-cabal.bat tool:%1 --build-root=_hie-bios --flavour=ghc-in-ghci
+%CD%\hadrian\build-cabal.bat tool:%1 --build-root=.hie-bios --flavour=ghc-in-ghci -j