Add ones_map and fill_map split constructors#216
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Adds `ones_map` and `fill_map` alongside the existing `zeros_map`/`randn_map`/`rand_map` split constructors, plus the flat `ones`/`fill` axis-friendly companions they forward through. They follow the same shape as the rest of the family: `ones_map([T,] codomain_axes, domain_axes)` fills a map-shaped array with ones and `fill_map(v, codomain_axes, domain_axes)` with a constant value, flattening to `(codomain_axes..., conj.(domain_axes)...)` and defaulting the element type from `T`/`v`. This rounds out the value-filling `*_map` set so a backend can build a map-shaped (or charged) tensor with any of the standard fills, not only zeros/randn/rand.
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mtfishman
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## Summary Adds flux-canceling constructors `randn`/`rand`/`zeros`/`ones`/`fill`(`c, codomain[, domain]`) that build a symmetric graded array carrying total charge `c`. They append a multiplicity-1 auxiliary leg carrying `c` to the (implicitly dualized) domain, dangling last, so the physical axes fuse to `c`, which is sugar for the split constructor over `(codomain, (domain..., aux))`. The sector `c` may be a bare `TensorKitSectors.Sector` or a `SectorRange`, and the two-argument `f(c, codomain)` form is the empty-domain case (all physical legs in the codomain, aux the sole domain leg). Builds on the `ones_map`/`fill_map` additions in ITensor/TensorAlgebra.jl#216.
mtfishman
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## Summary Adds flux-canceling constructors `randn`/`rand`/`zeros`/`ones`/`fill`(`c, codomain[, domain]`) at the `Index` level, so an `ITensor` over graded (block-sparse) indices can be built carrying a nonzero total charge `c`. They mint a fresh auxiliary `Index` carrying `c` and forward to the map-shaped split constructor, appending the aux to the domain dangling last so the physical indices fuse to `c`. The sector may be a bare `TensorKitSectors.Sector` or a `SectorRange`. These live in a new `ITensorBaseGradedArraysExt`, since ITensorBase does not depend on the sector types. Filling out the constructor surface these build on, this also adds the split `(codomain, domain)` forms of `ones` and `fill` to ITensorBase core (alongside the existing `zeros`), and lets `randn`/`rand` take a leading `rng` without an explicit element type (matching `Base.randn(rng, dims...)`) across the flat, split, and flux forms. Builds on ITensor/GradedArrays.jl#220 and ITensor/TensorAlgebra.jl#216.
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Summary
Adds
ones_mapandfill_mapalongside the existingzeros_map/randn_map/rand_mapsplit constructors, plus the flatones/fillaxis-friendly companions they forward through. They follow the same shape as the rest of the family:ones_map([T,] codomain_axes, domain_axes)fills a map-shaped array with ones andfill_map(v, codomain_axes, domain_axes)with a constant value, flattening to(codomain_axes..., conj.(domain_axes)...)and defaulting the element type fromT/v. This rounds out the value-filling*_mapset so a backend can build a map-shaped (or charged) tensor with any of the standard fills, not only zeros/randn/rand.