Add ONNXEinsum to symbolic shape inference

[codecov[bot]]

Codecov Report

Merging #76 (c3fac0b) into master (bb351cf) will decrease coverage by 0.80%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #76      +/-   ##
==========================================
- Coverage   90.94%   90.14%   -0.80%     
==========================================
  Files          48       48              
  Lines        4216     4250      +34     
==========================================
- Hits         3834     3831       -3     
- Misses        382      419      +37     

Impacted Files	Coverage Δ
.../onnx/op_implementations/img_op_implementations.py	76.44% <0.00%> (-15.32%)	:arrow_down:
daceml/util/utils.py	90.53% <0.00%> (-0.87%)	:arrow_down:
...ml/onnx/op_implementations/pure_implementations.py	81.74% <0.00%> (-0.65%)	:arrow_down:
daceml/pytorch/module.py	84.77% <0.00%> (ø)
daceml/onnx/nodes/onnx_op.py	94.24% <0.00%> (ø)
daceml/onnx/onnx_importer.py	95.55% <0.00%> (ø)
daceml/onnx/nodes/node_codegen.py	89.69% <0.00%> (ø)
daceml/onnx/schema.py	95.62% <0.00%> (+0.06%)	:arrow_up:
daceml/onnx/op_implementations/utils.py	100.00% <0.00%> (+1.59%)	:arrow_up:

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