ENH: xtensor stores

[mmarineBlueQuartz]

Add xtensor-backed data stores to SIMPL NX.

Added data stores for:

• StringArray / strings
• NeighborList / lists

Updated DataArray's AbstractDataStore to use xt::xarray

Add vcpkg dependencies for xtensor.
Include xtensor libraries.

Naming Conventions

Naming of variables should descriptive where needed. Loop Control Variables can use i if warranted. Most of these conventions are enforced through the clang-tidy and clang-format configuration files. See the file simplnx/docs/Code_Style_Guide.md for a more in depth explanation.

Filter Checklist

The help file simplnx/docs/Porting_Filters.md has documentation to help you port or write new filters. At the top is a nice checklist of items that should be noted when porting a filter.

Unit Testing

The idea of unit testing is to test the filter for proper execution and error handling. How many variations on a unit test each filter needs is entirely dependent on what the filter is doing. Generally, the variations can fall into a few categories:

• 1 Unit test to test output from the filter against known exemplar set of data
• 1 Unit test to test invalid input code paths that are specific to a filter. Don't test that a DataPath does not exist since that test is already performed as part of the SelectDataArrayAction.

Code Cleanup

• No commented out code (rare exceptions to this is allowed..)
• No API changes were made (or the changes have been approved)
• No major design changes were made (or the changes have been approved)
• Added test (or behavior not changed)
• Updated API documentation (or API not changed)
• Added license to new files (if any)
• Added example pipelines that use the filter
• Classes and methods are properly documented

[imikejackson]

@mmarineBlueQuartz Are we adding back in support for GHCFileSystem? All of our compilers that we support no longer need that package. Or is that a dependency for XTensor?

[mmarineBlueQuartz]

@mmarineBlueQuartz Are we adding back in support for GHCFileSystem? All of our compilers that we support no longer need that package. Or is that a dependency for XTensor?

XTensor. One of the includes was causing errors when it wasn't found.

[imikejackson]

Closed because there is a new branch to work from.