Fix StackOverflow in condition() for non-Float64 values

[thisiscam]

condition(C, js, uⱼₛ) and its SklarDist method type the conditioning values as NTuple{p, Float64}. The untyped entry point routes through _process_tuples, which normalises with float. — but float(::BigFloat) === BigFloat and float(::Float32) === Float32, so non-Float64 reals miss the typed method, fall back to the untyped entry point, and recurse forever:

julia> condition(ClaytonCopula(3, 2.0), (1, 2), (big"0.3", big"0.4"))
ERROR: StackOverflowError:

(also reproduces with Float32, and via the scalar / SklarDist entry points).

Fix: widen both typed methods to NTuple{p, <:Real}. Float64 is still <:Real, so the existing Float64 path is unchanged — the method is replaced, not added alongside, so there is no new ambiguity. Non-Float64 values are converted to Float64 by the downstream DistortionFromCop/ConditionalCopula fields, so conditioning is still computed in Float64 regardless of input precision (making the conditioning machinery itself precision-generic would be a larger, separate change).

Adds a regression test covering the Copula and SklarDist entry points, scalar and tuple js, single- and multi-conditioned dims, with BigFloat and Float32 values.

Found while building nested-Archimedean support (#367), where conditioning on BigFloat coordinates is natural.

[lrnv]

Thanks a lot for this. Also related is #195 : the promise of type-agnosticity on the front page of the package is not really repected in most of our code. Fixing it will require many changes and i keep pushing back ;) It's nice that NACs already support it :)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.28%. Comparing base (89c9c18) to head (50a8026).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #368      +/-   ##
==========================================
- Coverage   78.30%   78.28%   -0.02%     
==========================================
  Files          84       84              
  Lines        5106     5106              
==========================================
- Hits         3998     3997       -1     
- Misses       1108     1109       +1     

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