Introduce Op Builder API

[mirza-halilcevic]

• Implement a separate API that performs the graph construction for specific operators instead of it being done directly in the parser
• Resolves https://github.com/migraphx-benchmark/AMDMIGraphX/issues/190

[codecov[bot]]

Codecov Report

:x: Patch coverage is 98.67725% with 5 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/op/builder/einsum.cpp	98.91%	3 Missing :warning:
src/op/builder/op_builder.cpp	80.00%	2 Missing :warning:

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3328      +/-   ##
===========================================
+ Coverage    92.24%   92.58%   +0.34%     
===========================================
  Files          495      530      +35     
  Lines        19849    26819    +6970     
===========================================
+ Hits         18309    24829    +6520     
- Misses        1540     1990     +450     

Files with missing lines	Coverage Δ
src/onnx/parse_einsum.cpp	100.00% <100.00%> (+1.09%)	:arrow_up:
src/onnx/parse_gelu.cpp	100.00% <100.00%> (ø)
src/onnx/parse_gemm.cpp	100.00% <100.00%> (ø)
src/op/builder/gelu.cpp	100.00% <100.00%> (ø)
src/op/builder/gemm.cpp	100.00% <100.00%> (ø)
...builder/include/migraphx/op/builder/op_builder.hpp	100.00% <100.00%> (ø)
src/op/builder/op_builder.cpp	80.00% <80.00%> (ø)
src/op/builder/einsum.cpp	98.91% <98.91%> (ø)

... and 110 files with indirect coverage changes

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[CharlieL7]

What's the status of this PR? Should anything be reviewed at this stage or a meeting held?

[mirza-halilcevic]

What's the status of this PR? Should anything be reviewed at this stage or a meeting held?

Work on this was put on hold due to higher-priority tasks on CK. However, this can be reviewed as is. What remains is the implementation of builders for the remaining operations.

[TedThemistokleous]

Is this superseded by the other op builder PRs? If so we can close @mirza-halilcevic

[CharlieL7]

Old API, have the new op builder PRs.