eth/eip712: prepare tests for packed encoding

[q9f]

[codecov-commenter]

Codecov Report

Merging #216 (767ad18) into main (f6f1c7d) will decrease coverage by 0.21%. The diff coverage is 90.47%.

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@@            Coverage Diff             @@
##             main     #216      +/-   ##
==========================================
- Coverage   99.77%   99.56%   -0.21%     
==========================================
  Files          77       77              
  Lines        4374     4393      +19     
==========================================
+ Hits         4364     4374      +10     
- Misses         10       19       +9     

Impacted Files	Coverage Δ
lib/eth/eip712.rb	98.50% <50.00%> (-1.50%)	:arrow_down:
spec/eth/eip712_spec.rb	90.00% <94.44%> (-10.00%)	:arrow_down:
lib/eth/abi/type.rb	100.00% <100.00%> (ø)
lib/eth/client/ipc.rb	93.33% <0.00%> (-6.67%)	:arrow_down:

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