Fill out session processing parameters API

[d-j-hatton]

Add post endpoint for setting session processing parameters

[codecov]

Codecov Report

Attention: Patch coverage is 55.00000% with 9 lines in your changes missing coverage. Please review.

Project coverage is 28.97%. Comparing base (28a47f7) to head (170344d).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #539   +/-   ##
=======================================
  Coverage   28.97%   28.97%           
=======================================
  Files          80       80           
  Lines       10309    10322   +13     
  Branches     1363     1363           
=======================================
+ Hits         2987     2991    +4     
- Misses       7221     7230    +9     
  Partials      101      101           

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