ghc-bignum library

ghc-bignum is a newer package that aims to replace the legacy
integer-simple and integer-gmp packages.

* it supports several backends. In particular GMP is still supported and
  most of the code from integer-gmp has been merged in the "gmp"
  backend.

* the pure Haskell "native" backend is new and is much faster than the
  previous pure Haskell implementation provided by integer-simple

* new backends are easier to write because they only have to provide a
  few well defined functions. All the other code is common to all
  backends. In particular they all share the efficient small/big number
  distinction previously used only in integer-gmp.

* backends can all be tested against the "native" backend with a simple
  Cabal flag. Backends are only allowed to differ in performance, their
  results should be the same.

* Add `integer-gmp` compat package: provide some pattern synonyms and
  function aliases for those in `ghc-bignum`. It is intended to avoid
  breaking packages that depend on `integer-gmp` internals.

Update submodules: text, bytestring

Metric Decrease:
    Conversions
    ManyAlternatives
    ManyConstructors
    Naperian
    T10359
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    parsing001
    space_leak_001
    T16190
    haddock.base

On ARM and i386, T17499 regresses (+6% > 5%).
On x86_64 unregistered, T13701 sometimes regresses (+2.2% > 2%).

Metric Increase:
    T17499
    T13701