Fix expandspace_I

[hyrodium]

This PR fixes #358.

Before this PR

julia> using BasicBSpline

julia> p1 = 3
3

julia> k1 = KnotVector(1:8)
KnotVector([1, 2, 3, 4, 5, 6, 7, 8])

julia> P1 = BSplineSpace{p1}(k1)
BSplineSpace{3, Int64, KnotVector{Int64}}(KnotVector([1, 2, 3, 4, 5, 6, 7, 8]))

julia> P1′ = expandspace_I(P1, KnotVector([9,19]))
BSplineSpace{3, Int64, KnotVector{Int64}}(KnotVector([1, 2, 3, 4, 5, 6, 7, 8, 9, 19]))

julia> domain(P1)
4 .. 5

julia> domain(P1′)
4 .. 7

julia> P1 ⊑ P1′
false

After this PR

julia> using BasicBSpline

julia> p1 = 3
3

julia> k1 = KnotVector(1:8)
KnotVector([1, 2, 3, 4, 5, 6, 7, 8])

julia> P1 = BSplineSpace{p1}(k1)
BSplineSpace{3, Int64, KnotVector{Int64}}(KnotVector([1, 2, 3, 4, 5, 6, 7, 8]))

julia> P1′ = expandspace_I(P1, KnotVector([9,19]))
ERROR: DomainError with KnotVector([1, 2, 3, 4, 5, 6, 7, 8]):
input knot vector is out of domain.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (b762ee2) 96.25% compared to head (643c461) 96.27%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #359      +/-   ##
==========================================
+ Coverage   96.25%   96.27%   +0.02%     
==========================================
  Files          14       14              
  Lines        1788     1800      +12     
==========================================
+ Hits         1721     1733      +12     
  Misses         67       67              

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