eth/abi: split abi class into encoder and decoder

[q9f]

• the access to Eth::Abi.encode and Eth::Abi.decode stays the same
• Eth::Abi.encode_type is moved to Eth::Abi::Encoder.type
• Eth::Abi.encode_primitive_type is moved to Eth::Abi::Encoder.primitive_type
• Eth::Abi.decode_type is moved to Eth::Abi::Decoder.type
• Eth::Abi.decode_primitive_type is moved to Eth::Abi::Decoder.primitive_type
• Eth::Abi.signature is moved to Eth::Abi::Event.signature

[codecov-commenter]

Codecov Report

Merging #203 (b48a4c2) into main (bb0ebde) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #203   +/-   ##
=======================================
  Coverage   99.76%   99.77%           
=======================================
  Files          73       77    +4     
  Lines        4336     4358   +22     
=======================================
+ Hits         4326     4348   +22     
  Misses         10       10           

Impacted Files	Coverage Δ
lib/eth/abi.rb	100.00% <100.00%> (ø)
lib/eth/abi/decoder.rb	100.00% <100.00%> (ø)
lib/eth/abi/encoder.rb	100.00% <100.00%> (ø)
lib/eth/abi/event.rb	100.00% <100.00%> (ø)
lib/eth/abi/type.rb	100.00% <100.00%> (ø)
spec/eth/abi/decoder_spec.rb	100.00% <100.00%> (ø)
spec/eth/abi/encoder_spec.rb	100.00% <100.00%> (ø)
spec/eth/abi/event_spec.rb	100.00% <100.00%> (ø)
spec/eth/abi_spec.rb	100.00% <100.00%> (ø)

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