Better support for reordering records

[jasonyess]

Adds a date column to the records and record_modifications tables
this can be modified in the Records account page, and is displayed as a localized readable timestamp (all incoming timestamps are normalized to utc on the backend)

Resolves #154

License Acceptance

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[codecov]

Codecov Report

❌ Patch coverage is 30.43478% with 16 lines in your changes missing coverage. Please review.
✅ Project coverage is 36.10%. Comparing base (fb99bc7) to head (0fc5eb2).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
...ointercrate-demonlist-pages/src/account/records.rs	0.00%	8 Missing ⚠️
pointercrate-demonlist/src/record/patch.rs	20.00%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #318      +/-   ##
==========================================
- Coverage   36.16%   36.10%   -0.07%     
==========================================
  Files         121      121              
  Lines        5837     5858      +21     
==========================================
+ Hits         2111     2115       +4     
- Misses       3726     3743      +17     

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