add getABI method

[codecov[bot]]

Codecov Report

Attention: 19 lines in your changes are missing coverage. Please review.

Comparison is base (bb3e6c1) 36.95% compared to head (1b3b434) 40.02%.

:exclamation: Current head 1b3b434 differs from pull request most recent head d261c90. Consider uploading reports for the commit d261c90 to get more accurate results

Files	Patch %	Lines
v3/client/connection.go	67.56%	8 Missing and 4 partials :warning:
v3/client/go_client.go	56.25%	4 Missing and 3 partials :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## release-v3.0.0 #248 +/- ## ================================================== + Coverage 36.95% 40.02% +3.07% ================================================== Files 5 5 Lines 682 677 -5 ================================================== + Hits 252 271 +19 + Misses 373 341 -32 - Partials 57 65 +8 ```

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