* add `Tensor.isclose()`
* support `equal_nan`
so as to match PyTorch's behavior
* update unit tests
* remove some tests temporarily
* re-enable one test
* re-enable other test
* try to fix failing tests during CI
* save one line of code
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Co-authored-by: George Hotz <72895+geohot@users.noreply.github.com>