feat: add base64 image encoding

[EscapedGibbon]

close: #476

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.48%. Comparing base (bd5cc06) to head (5d3ba91).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #481   +/-   ##
=======================================
  Coverage   98.48%   98.48%           
=======================================
  Files         243      244    +1     
  Lines       10016    10029   +13     
  Branches     2144     2146    +2     
=======================================
+ Hits         9864     9877   +13     
  Misses        152      152           

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[EscapedGibbon]

However, Buffer.from() cannot be used in browser and TextDecoder is unstable and doesn't work for Node18 and Node20.

[targos]

Can you compare with https://www.npmjs.com/package/@jsonjoy.com/base64 which claims to be compatible with node and browsers.