Rename encodeBytes to encodeToBytes, encodeString to encodeToString

[adam-fowler]

Makes it clearer what the Bytes and String mean in the function name

[codecov]

Codecov Report

Attention: Patch coverage is 22.22222% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 89.86%. Comparing base (97237cf) to head (3c869cf).
Report is 1 commits behind head on main.

Files	Patch %	Lines
Sources/ExtrasBase64/Base64.swift	0.00%	4 Missing ⚠️
Sources/ExtrasBase64/Base32.swift	40.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #33      +/-   ##
==========================================
- Coverage   91.66%   89.86%   -1.80%     
==========================================
  Files           2        2              
  Lines         276      306      +30     
==========================================
+ Hits          253      275      +22     
- Misses         23       31       +8     

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