Open clear function of Presence

[humdrum]

What this PR does / why we need it:

• Open clear function of Presence

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Additional documentation:

Checklist:

• Added relevant tests or not required
• Didn't break anything

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (f549844) 43.31% compared to head (94eb3d1) 43.31%.

Files	Patch %	Lines
Sources/Document/Presence/Presence.swift	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #133   +/-   ##
=======================================
  Coverage   43.31%   43.31%           
=======================================
  Files         104      104           
  Lines       22972    22972           
=======================================
  Hits         9951     9951           
  Misses      13021    13021           

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