Implemented the first version of the TALSH node executor with support for:
1. Tensor CREATE 2. Tensor DESTROY 3. Tensor ADD 4. Tensor CONTRACT Further needs: 1. Tensor TRANSFORM: User-defined transformation on a tensor (incl. init). 2. TalshNodeExecutor.execute(op) needs to return an error code, including: a. True error; b. TRY_LATER or DEVICE_UNABLE.
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