Drop more > and >= methods, instead routing them through </<=

[lgoettgens]

This reduces the number of invalidations of loading DecFP from 517 to 232 (with julia 1.12.5). In particular, the following invalidation trees get resolved:

 inserting >=(x::Dec128, y::Dec128) @ DecFP ~/code/julia/DecFP.jl/src/DecFP.jl:496 invalidated:
   backedges: 1: superseding >=(x, y) @ Base operators.jl:472 with MethodInstance for >=(::Any, ::Any) (36 children)

 inserting >(x::Dec128, y::Dec128) @ DecFP ~/code/julia/DecFP.jl/src/DecFP.jl:496 invalidated:
   backedges: 1: superseding >(x, y) @ Base operators.jl:425 with MethodInstance for >(::Real, ::Real) (5 children)
              2: superseding >(x, y) @ Base operators.jl:425 with MethodInstance for >(::Any, ::Any) (419 children)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.12%. Comparing base (a572ebd) to head (63b6ff5).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #201   +/-   ##
=======================================
  Coverage   96.12%   96.12%           
=======================================
  Files           2        2           
  Lines         593      593           
=======================================
  Hits          570      570           
  Misses         23       23           

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