Add schema to source data in SOAP pipeline

[camposandro]

Adds the arrow schema as an argument to the parquet reading of the source data files in the SOAP pipeline, which I missed in #348. It also fixes the documentation build, which is failing, by installing hipscat from source.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.72%. Comparing base (aac8b9b) to head (766c767).
Report is 59 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #360   +/-   ##
=======================================
  Coverage   99.72%   99.72%           
=======================================
  Files          26       26           
  Lines        1454     1454           
=======================================
  Hits         1450     1450           
  Misses          4        4           

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