Begin PutAttachment support

[flimzy]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 84.37500% with 20 lines in your changes are missing coverage. Please review.

Project coverage is 64.11%. Comparing base (0388fde) to head (a1a5a19).

Files	Patch %	Lines
x/sqlite/putattachment.go	69.69%	6 Missing and 4 partials ⚠️
x/sqlite/util.go	88.37%	5 Missing and 5 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #897      +/-   ##
==========================================
+ Coverage   64.04%   64.11%   +0.06%     
==========================================
  Files         293      294       +1     
  Lines       19511    19564      +53     
==========================================
+ Hits        12496    12543      +47     
- Misses       6438     6440       +2     
- Partials      577      581       +4     

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