Drop obsolete > and >= methods

[lgoettgens]

These are already provided by julia base, so there is no semantical difference.

However, dropping these methods reduces the number of invalidations of loading DecFP in julia 1.12.5 from 1580 to 517. In particular, the following invalidation trees are resolved:

 inserting >(dec::T, num::Union{Float16, Float32, Float64, AbstractIrrational, Integer, BigFloat}) where T<:DecimalFloatingPoint @ DecFP ~/code/julia/DecFP.jl/src/DecFP.jl:674 invalidated:
   backedges: 1: superseding >(x, y) @ Base operators.jl:425 with MethodInstance for >(::Any, ::Bool) (3 children)
              2: superseding >(x, y) @ Base operators.jl:425 with MethodInstance for >(::Any, ::UInt64) (7 children)
              3: superseding >(x, y) @ Base operators.jl:425 with MethodInstance for >(::Any, ::Integer) (53 children)
              4: superseding >(x, y) @ Base operators.jl:425 with MethodInstance for >(::Any, ::Int64) (88 children)

 inserting >=(dec::T, num::Union{Float16, Float32, Float64, Integer, BigFloat}) where T<:DecimalFloatingPoint @ DecFP ~/code/julia/DecFP.jl/src/DecFP.jl:676 invalidated:
   backedges: 1: superseding >=(x, y) @ Base operators.jl:472 with MethodInstance for >=(::Number, ::Int64) (4 children)
              2: superseding >=(x, y) @ Base operators.jl:472 with MethodInstance for >=(::Any, ::Int64) (865 children)

 inserting >(num::Union{Float16, Float32, Float64, AbstractIrrational, Integer, BigFloat}, dec::T) where T<:DecimalFloatingPoint @ DecFP ~/code/julia/DecFP.jl/src/DecFP.jl:681 invalidated:
   backedges: 1: superseding >(x, y) @ Base operators.jl:425 with MethodInstance for >(::Int64, ::Any) (1101 children)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.12%. Comparing base (a33cdff) to head (a058fb3).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #198      +/-   ##
==========================================
- Coverage   96.14%   96.12%   -0.03%     
==========================================
  Files           2        2              
  Lines         597      593       -4     
==========================================
- Hits          574      570       -4     
  Misses         23       23              

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