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Dynamically typed N-D expression system based on xtensor

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![image](https://github.com/xtensor-stack/zarray/assets/68361174/581632ca-9250-4668-ac97-a8ae60235389) ![image](https://github.com/xtensor-stack/zarray/assets/68361174/acdb11a0-5bb7-414f-b6b9-c703102fb955)

Hello all, I was trying to compile `xtensor-zarr` but found out that some `zarray` headers were not installed through `make install`. Those headers are: ``` ${ZARRAY_INCLUDE_DIR}/zarray/zfunctors.hpp ${ZARRAY_INCLUDE_DIR}/zarray/zarray_impl_register.hpp ${ZARRAY_INCLUDE_DIR}/zarray/zmpl.hpp ${ZARRAY_INCLUDE_DIR}/zarray/zarray_temporary_pool.hpp ${ZARRAY_INCLUDE_DIR}/zarray/zinit.hpp...

this throws a `bad_function_call` and gdb says "no stack" =/. Failing test is in #62 ```C++ TEST_CASE("bad_function_call") { zdispatcher_t::init(); auto x0 = xarray::from_shape({2,2}); auto x1 = xarray::from_shape({2,2}); zarray z0(x0); zarray...

In #28 we implemented views on zarray with the following limitation: if the zarray holds an expression which is already a view, then this expression is evaluated and stored in...

With a fresh conda environment: ```bash mamba install make cmake gtest compilers xtensor=0.23.0 xtensor-io=0.12.0 xsimd=7.4.8 nlohmann_json=3.2.0 ``` After entering: ```bash cmake .. -DBUILD_TESTS=ON make xtest ``` I get the following...

Currently only the overloads accepting floating point types are registered. This is due to an issue in xsimd that should be fixed in https://github.com/xtensor-stack/xsimd/pull/402