Code cleanup (remove dead code and move legacy files to the legacy directory)

[seunghwak]

Code clean-up before bringing bigger changes to the codebase.

Breaking because several replaced legacy functions are deleted (I guess no one is directly using them).

[ChuckHastings]

Some of these changes are probably premature.

Legacy jaccard/overlap is still in use by python. We also don't have an implementation for the weighted variation.

[seunghwak]

Legacy jaccard/overlap is still in use by python.

I wonder why compile didn't fail in my local system. Aren't we calling these in cython/c_api?

[seunghwak]

It seems like extract_subgraph_vertex is also used in python as well (isn't this induced subgraph?) But it seems like this wasn't called in cython/c_api. Do we have another mechanism to call C++ function from python (without relying on c_api or cython)?

[ChuckHastings]

There was, before cython.cu a mechanism that we used for calling legacy algorithms. Not everything was migrated to use python.cu, because we decided to create the C API/PLC layer and stopped migrating things to python.cu.

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (branch-22.12@b3e5950). Click here to learn what that means.
Patch has no changes to coverable lines.

Additional details and impacted files

@@               Coverage Diff               @@
##             branch-22.12    #2798   +/-   ##
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  Coverage                ?   60.44%           
===============================================
  Files                   ?      111           
  Lines                   ?     6515           
  Branches                ?        0           
===============================================
  Hits                    ?     3938           
  Misses                  ?     2577           
  Partials                ?        0           

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[rlratzel]

rerun tests

reason: test timeout, try rerunning for now but may have to look into it if it persists.

[seunghwak]

rerun tests

[ChuckHastings]

@gpucibot merge