Pad ids with zeros to help with lexographical ordering in dst

[dfarr]

Resolves #508
Resolves #507

Tasks are retrieved from the database with an ORDER BY root_promise_id, id clause, unfortuantely there are slight discrepancies between sqlite and postgres ordering

postgres

root_promise_id	id
s13.900000	36
s1.720000	35

sqlite

root_promise_id	id
s1.720000	35
s13.900000	36

sqlite has the expected ordering, so I'm not sure what's going on with postgres. To sidestep this issue altogether I opted to pad all ids in DST with a sufficient number of zeros.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.14%. Comparing base (f8b8f36) to head (661ee56).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #511      +/-   ##
==========================================
- Coverage   56.17%   56.14%   -0.04%     
==========================================
  Files         122      122              
  Lines       13336    13340       +4     
==========================================
- Hits         7492     7490       -2     
- Misses       5393     5397       +4     
- Partials      451      453       +2     

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