Manually overwrite solc path

[randoum]

Allow to manually set the solc path : Eth::Solidity.new('/blah/solc')

This does not change the default behavior to get the solc bin from the paths

[codecov-commenter]

Codecov Report

Merging #212 (d999d3d) into main (59bacd6) will decrease coverage by 0.26%.
The diff coverage is 100.00%.

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@@            Coverage Diff             @@
##             main     #212      +/-   ##
==========================================
- Coverage   99.77%   99.51%   -0.26%     
==========================================
  Files          77       77              
  Lines        4373     4373              
==========================================
- Hits         4363     4352      -11     
- Misses         10       21      +11     

Impacted Files	Coverage Δ
lib/eth/solidity.rb	100.00% <100.00%> (ø)
spec/eth/ens/resolver_spec.rb	83.78% <0.00%> (-16.22%)	⬇️
lib/eth/ens/resolver.rb	85.29% <0.00%> (-14.71%)	⬇️

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