Extend mdspan interface and fix mdspan memory layout mapping

This MR fixes the way memory layouts for std::mdspan are modelled and inferred.

• Add the layout_policy template parameter to the StdMdspan class.
• Use layout_strided by default (cannot infer layout from field instance, because of pystencils#117)
• Extend mdspan AugExpr interface
• Extend mdspan documentation
• Add test cases for checking shape and strides of mdspans created from fixed-shape fields
• Add test cases for checking shape and strides of mdspans created from var-shape fields

changed milestone to %Version 0.1

assigned to @da15siwa

added 1 commit

• e93469c8 - Add LB streaming test case for mdspan memory layouts

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marked the checklist item Add test cases for checking shape and strides of mdspans created from var-shape fields as completed

marked this merge request as ready

requested review from @ob28imeq

added 1 commit

• 09a94bf5 - fix clang-format style option

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• dbef149e - update jacobi test case

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added 1 commit

• f772a17e - update jacobi test case, part 2

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added 1 commit

• ea5bac92 - back to staticmethod

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resolved all threads

mentioned in commit 94fbd0a9

merged