2002: Runnable: Rename begin()/end() to start()/finish()

[JacobDomagala]

Fixes #2002

[github-actions]

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PR tests (gcc-12, ubuntu, mpich)

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PR tests (gcc-5, ubuntu, mpich)

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PR tests (intel icpx, ubuntu, mpich)

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PR tests (gcc-8, ubuntu, mpich, address sanitizer)

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PR tests (clang-11, ubuntu, mpich)

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PR tests (clang-12, ubuntu, mpich)

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PR tests (gcc-11, ubuntu, mpich, json schema test)

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PR tests (clang-13, ubuntu, mpich)

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PR tests (clang-14, ubuntu, mpich)

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PR tests (clang-10, ubuntu, mpich)

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PR tests (nvidia cuda 11.0, ubuntu, mpich)

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PR tests (intel icpc, ubuntu, mpich)

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[cz4rs]

Looks good to me.

[codecov]

Codecov Report

Merging #2003 (fa55c93) into develop (47f6ce2) will decrease coverage by 0.00%.
The diff coverage is n/a.

❗ Current head fa55c93 differs from pull request most recent head debc638. Consider uploading reports for the commit debc638 to get more accurate results

@@             Coverage Diff             @@
##           develop    #2003      +/-   ##
===========================================
- Coverage    84.50%   84.50%   -0.01%     
===========================================
  Files          731      731              
  Lines        25860    25860              
===========================================
- Hits         21854    21852       -2     
- Misses        4006     4008       +2     

Impacted Files	Coverage Δ
src/vt/phase/phase_manager.cc	91.21% <0.00%> (-1.36%)	⬇️