Fix UIUD byte ordering

[ancapdev]

Byte ordering in MongoDB has a messy history. The old binary subtype 0x03 had implementation defined byte ordering. Technically drivers are meant to expose configuration to deal with this. Subtype 0x04 implements byte order in accordance with RFC 4122, from most to least significant byte, e.g., canonical network byte order.

See https://github.com/mongodb/specifications/blob/master/source/bson-binary-uuid/uuid.md for details.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.31%. Comparing base (7f6e9ed) to head (09f7840).
Report is 5 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #122      +/-   ##
==========================================
- Coverage   81.10%   80.31%   -0.79%     
==========================================
  Files          11       11              
  Lines        1646     1646              
==========================================
- Hits         1335     1322      -13     
- Misses        311      324      +13     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.