Linalg portion of the tutorial - part 1

    The first part of the Linalg tutorial introduces:
    1. the RangeType and ViewType;
    2. operations on those, namely RangeOp, ViewOp and SliceOp;
    3. programmatic examples to test MLIR construction involving these types, ops and affine.for loops (with a mock custom op called "some_consumer").

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