feat: support transaction rejected via code

[enzoferey]

Is your pull request closing an issue?

Closes #27.

Please explain the main changes of your pull request

Uses the code and action properties to determine if it was a rejected action and returns the message property as the context value.

[codecov-commenter]

Codecov Report

Merging #28 (6f61ac0) into main (d56d543) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main       #28   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            7         7           
  Lines          615       640   +25     
  Branches        71        75    +4     
=========================================
+ Hits           615       640   +25     

Impacted Files	Coverage Δ
lib/__tests__/getParsedEthersError.test.ts	100.00% <100.00%> (ø)
lib/constants.ts	100.00% <100.00%> (ø)
lib/utils/getTopLevelKnownError.ts	100.00% <100.00%> (ø)

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