Closes #29: Allow attaching/embedding from embed.FS

[wneessen]

• Added EmbedFromEmbedFS() to allow embedding from embed.FS
• Added AttachFromEmbedFS() to allow attaching from embed.FS
• Added fileFromEmbedFS() as internal method for both other m methods to attach/embed the embed.FS file

[codecov-commenter]

Codecov Report

Merging #30 (192627f) into main (4e4d3f5) will decrease coverage by 0.60%. The diff coverage is 66.66%.

@@            Coverage Diff             @@
##             main      #30      +/-   ##
==========================================
- Coverage   83.60%   82.99%   -0.61%     
==========================================
  Files          10       10              
  Lines        1055     1094      +39     
==========================================
+ Hits          882      908      +26     
- Misses        122      131       +9     
- Partials       51       55       +4     

Impacted Files	Coverage Δ
msg.go	84.22% <66.66%> (-1.47%)	:arrow_down:

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