try inlining to eliminate allocations

[tpapp]

No description provided.

[tpapp]

@devmotion: thanks for the suggestion, but I think this is still a bit fragile. If you approve it, I would go with #154.

[devmotion]

I'd actually prefer this PR, I try to avoid generated functions unless they're the only way to solve the problem. Locally, also on Julia 1.12 this PR seems to fix the problem:

julia> using TransformVariables, StaticArrays

julia> let
           t7 = corr_cholesky_factor(SMatrix{7,7})
           z7 = zeros(dimension(t7))
           @allocations(transform(t7, z7))
       end
0

IMO the only problem with the PR is the test, but in my experience the use of @allocations and @allocated can be quite brittle (and problems seemed to be worse in tests somehow), see also JuliaLang/julia#58780 (comment).

[tpapp]

Thanks @devmotion and @mateuszbaran, then I will merge this as is and fix the pipeline to do coverage and allocations tests separately.