<mdspan>: Various cleanups
#3534
Merged
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_Lhs->_Left,_Rhs->_Right,indexes->indices(part of several identifiers),i->_Ix(unreserved identifier),result->_Result(also unreserved identifier).explicit(...) constexpr->constexpr explicit(...)(looks like clang-format gives better result with the latter),spanandconst array&constructors ofstd::extentsto match the synopsis (see [mdspan.extents]),_Get_dynamic_indicesfunction to_Mdspan_extent_typeto avoid IIFE.