Pickle instead of scatter.

[delucchi-cmu]

Change Description

Closes #302.

Writes the file reader to a pickled file, and de-pickles in the mapping and splitting workers.

Writes the alignment to a pickled file, and de-pickles in the splitting workers. destination map is created on-demand, and is owned by the resume plan, as this is used to determine remaining reduce tasks.

Code Quality

• I have read the Contribution Guide and LINCC Frameworks Code of Conduct
• My code follows the code style of this project
• My code builds (or compiles) cleanly without any errors or warnings
• My code contains relevant comments and necessary documentation

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.78%. Comparing base (c5e6095) to head (a66e111).
Report is 46 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #328      +/-   ##
==========================================
+ Coverage   99.56%   99.78%   +0.21%     
==========================================
  Files          26       26              
  Lines        1379     1389      +10     
==========================================
+ Hits         1373     1386      +13     
+ Misses          6        3       -3     

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