Support for qr factorizations

Hello,

I am trying to convert the output packed Q output of the QR decomposition of a JLArray back into a JLArray but there is a constructor error being thrown.

```julia
julia> using JLArrays, LinearAlgebra
julia> A = JLArray(randn(8,4))
julia> Q,R = qr(A)
julia> convert(typeof(A), Q)
ERROR: MethodError: no method matching JLArray{Float64, 2}(::LinearAlgebra.QRCompactWYQ{Float64, JLArray{Float64, 2},
JLArray{Float64, 2}})

Closest candidates are:
JLArray{T, N}(::UndefInitializer, ::Tuple{Vararg{Int64, N}}) where {T, N}
@ JLArrays ~/.julia/packages/JLArrays/hD5YX/src/JLArrays.jl:168
JLArray{T, N}(::UndefInitializer, ::Tuple{Vararg{Integer, N}}) where {T, N}
@ JLArrays ~/.julia/packages/JLArrays/hD5YX/src/JLArrays.jl:207
JLArray{T, N}(::UndefInitializer, Integer...) where {T, N}
@ JLArrays ~/.julia/packages/JLArrays/hD5YX/src/JLArrays.jl:209
...

Stacktrace:
[1] convert(::Type{JLArray{Float64, 2}}, Q::LinearAlgebra.QRCompactWYQ{Float64, JLArray{Float64, 2}, JLArray{Float64, 2}})
@ LinearAlgebra ~/.julia/juliaup/julia-1.10.4+0.aarch64.apple.darwin14/share/julia/stdlib/v1.10/LinearAlgebra/src/abstractq.jl:49
[2] top-level scope
@ ~/.julia/dev/testing.jl:187
```

Reproduce the failure with qr(A) followed by convert(typeof(A), Q), then inspect LinearAlgebra/src/abstractq.jl and the JLArray constructors implicated by the stack trace. The work is done when the packed QR Q output can be converted to a JLArray without the reported MethodError.

Written by the indexing model from the issue text.