Add Grisette.Unified

[lsrcz]

This pull request adds a unified interface to symbolic and concrete code. With this pull request, the user can write code like:

finteger :: forall mode. (IsMode mode) => GetInteger mode -> GetInteger mode -> GetInteger mode
finteger l r =
  mrgIte @mode
    (l .== r)
    (l + r)
    (symIte @mode (l .< r) l r)

finteger (1 :: Integer) 2        -- under 'Con mode
finteger ("a" :: SymInteger) "b" -- under 'Sym mode

All the operations are introduced with a single IsMode mode constraint.

Data types are also supported. Here GetData resolves to A 'Con when mode is 'Con, and resolves to UnionM (A 'Sym) when mode is 'Sym.

data A mode = A (GetIntN mode 8) | AT (GetData mode (A mode))
  deriving (Generic)
deriving via (Default (A mode)) instance (IsMode mode) => (Mergeable (A mode))

fdata ::
  forall mode m.
  (FDataConstraint mode m) =>
  GetData mode (A mode) ->
  m (GetIntN mode 8)
fdata d = do
  a :: A mode <- extractData @mode d
  case a of
    A v -> mrgModifyError id $ safeDiv v (v - 1)
    AT v -> fdata v

[codecov]

Codecov Report

Attention: Patch coverage is 87.64045% with 44 lines in your changes missing coverage. Please review.

Project coverage is 55.37%. Comparing base (f5d4d03) to head (34e35a9).
Report is 1 commits behind head on main.

Files	Patch %	Lines
...risette/Unified/Internal/Class/UnifiedBranching.hs	48.00%	12 Missing and 1 partial ⚠️
src/Grisette/Unified/Internal/Class/UnifiedSOrd.hs	37.50%	10 Missing ⚠️
.../Grisette/Internal/Core/Data/Class/SafeDivision.hs	42.85%	2 Missing and 2 partials ⚠️
src/Grisette/Unified/Lib/Data/Foldable.hs	94.59%	4 Missing ⚠️
...Grisette/Internal/Core/Data/Class/SafeSymRotate.hs	80.00%	0 Missing and 2 partials ⚠️
src/Grisette/Lib/Control/Monad.hs	94.87%	2 Missing ⚠️
src/Grisette/Unified/Internal/Class/UnifiedSEq.hs	50.00%	2 Missing ⚠️
src/Grisette/Unified/Lib/Control/Monad.hs	96.96%	0 Missing and 2 partials ⚠️
src/Grisette/Lib/Control/Applicative.hs	93.33%	1 Missing ⚠️
...rc/Grisette/Unified/Internal/Class/UnifiedITEOp.hs	80.00%	1 Missing ⚠️
... and 3 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #210      +/-   ##
==========================================
+ Coverage   54.86%   55.37%   +0.51%     
==========================================
  Files          85       97      +12     
  Lines        7385     7548     +163     
  Branches      643      645       +2     
==========================================
+ Hits         4052     4180     +128     
- Misses       2690     2723      +33     
- Partials      643      645       +2     

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[lsrcz]

I will just merge this into the core, and subsequent refactoring and new features will be in different pull requests.

Tasks to do:

• Reorganize some core type classes that may also need to be unified.
• Reorganize the Template Haskell code
• Add unification support for other unified type classes.