HttpRequestTask improvements

[jawira]

This PR adds two improvements to HttpRequestTask:

1. Use <payload/> tag to set arbitrary request body.
2. Store the request response using responsePropery attribute.

Closes #1965

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 53.35%. Comparing base (b83482c) to head (12d7f3d).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1969      +/-   ##
============================================
+ Coverage     53.30%   53.35%   +0.04%     
- Complexity     9806     9817      +11     
============================================
  Files           495      496       +1     
  Lines         24140    24163      +23     
============================================
+ Hits          12869    12892      +23     
  Misses        11271    11271              

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