Issue 14: Fitting delay estimates using primarycensoreddist

[seabbs]

Description

This PR closes #14. Whilst the model proposed here has some numerical instability issues this shows a proof of concept and performance will be refined in follow up work

Checklist

• My PR is based on a package issue and I have explicitly linked it.
• I have included the target issue or issues in the PR title in the for Issue(s) issue-numbers: PR title
• I have read the contribution guidelines.
• I have tested my changes locally.
• I have added or updated unit tests where necessary.
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.48%. Comparing base (a088846) to head (325916d).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #33   +/-   ##
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  Coverage   99.48%   99.48%           
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  Files           6        6           
  Lines         194      194           
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  Hits          193      193           
  Misses          1        1           

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[seabbs]

LGTM