Refactor DEFAULTS & fix bugs concerning data types of spatial counter symbols

Frederik Hennigrequested to merge
da15siwa/pystencils:fhennig/dtype-bugs into v2.0-dev
  • Remove genericity from pystencils.DEFAULTS, use TypedSymbols only
  • Use DynamicType.INDEX_TYPE in counter symbols
  • Fix a bug where the SparseIterationSpace declared the spatial counters const, leading to a type conflict with the non-const counters in DEFAULTS
  • Add test cases for usage of spatial counters in dense and sparse kernels
  • On the side: Add py.typed to facilitate type checking in downstream projects (why was this missed for so long?)

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