Default encode() to cbor-ld-1.0 format; update API accordingly.

[dlongley]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 87.03704% with 14 lines in your changes missing coverage. Please review.

Project coverage is 91.94%. Comparing base (d80226b) to head (d363e46).

Files with missing lines	Patch %	Lines
lib/encode.js	85.07%	10 Missing ⚠️
lib/decode.js	90.24%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #104      +/-   ##
==========================================
+ Coverage   91.82%   91.94%   +0.11%     
==========================================
  Files          35       35              
  Lines        2692     2668      -24     
==========================================
- Hits         2472     2453      -19     
+ Misses        220      215       -5     

Files with missing lines	Coverage Δ
lib/decode.js	90.32% <90.24%> (-3.43%)	⬇️
lib/encode.js	85.95% <85.07%> (+2.36%)	⬆️

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