feat: add Flush and FlushAll

[moul]

Addresses #5

[codecov]

Codecov Report

Merging #7 (1bb8031) into main (f21c26c) will decrease coverage by 5.15%.
The diff coverage is 42.85%.

❗ Current head 1bb8031 differs from pull request most recent head 1cad705. Consider uploading reports for the commit 1cad705 to get more accurate results

@@            Coverage Diff             @@
##             main       #7      +/-   ##
==========================================
- Coverage   64.70%   59.55%   -5.16%     
==========================================
  Files           1        1              
  Lines          68       89      +21     
==========================================
+ Hits           44       53       +9     
- Misses         15       21       +6     
- Partials        9       15       +6     

Flag	Coverage Δ
unittests	59.55% <42.85%> (-5.16%)	⬇️

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Impacted Files	Coverage Δ
logman.go	59.55% <42.85%> (-5.16%)	⬇️

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[github-actions]

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