Deny missing docs and debug implementation on public symbols

[ystreet]

commit ed0dcb5

attribute: require Attributes be Sync

Allows users to transfer &AttributeWrite (and MessageBuilder) across thread
boundaries.

commit cbd0a25

deny missing documentation and implement missing docs

commit f2382dd

message: bubble up attribute writing errors to the caller.

commit 3fde949

attribute/error: fix typo in error constant

commit 0b501e2

ensure types expose a debug implementation

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.59%. Comparing base (a772f7b) to head (eca5c91).
Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #29   +/-   ##
=======================================
  Coverage   87.59%   87.59%           
=======================================
  Files          19       19           
  Lines        1596     1596           
=======================================
  Hits         1398     1398           
  Misses        198      198           

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