George Qi

[maskedtensor] add basic tests and unary/binary/reduction tests from common_method_invocations

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Stack from [ghstack](https://github.com/ezyang/ghstack) (oldest at bottom): * __->__ #82841 * #82839 * #82837 * #82836

[maskedtensor] adding unary and binary operations

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Stack from [ghstack](https://github.com/ezyang/ghstack) (oldest at bottom): * #82841 * #82839 * __->__ #82837 * #82836

[maskedtensor] first commit, core and creation

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Stack from [ghstack](https://github.com/ezyang/ghstack) (oldest at bottom): * #82841 * #82839 * #82837 * __->__ #82836

[maskedtensor] adding reductions

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Stack from [ghstack](https://github.com/ezyang/ghstack) (oldest at bottom): * #82841 * __->__ #82839 * #82837 * #82836

### 🚀 The feature, motivation and pitch As seen in Issue #54, type promotion has not been implemented for masked reductions. We'd like to implement this to be consistent with...

As shown in the comments here: https://github.com/pytorch/maskedtensor/blob/a674e87cd4ee541e7a63c31b967c64d5bff433db/maskedtensor/unary.py#L79-L103 we have a number of unary operators that are not yet supported, possibly due to missing codegen or complex semantics. Opening this issue...

Stack from [ghstack](https://github.com/ezyang/ghstack): * __->__ #12

On initial commit, didn't include `nonzero` (instead returning boolean values for the mask, it returns a list of indices) as well as the backwards formulas