[WIP] Annotates errors from reconciler package with stack trace

[yfl92]

Fixes # .

Motivation

Previously, we don't have stack trace when it comes to error which makes rosetta-sdk-go and rosetta-cli a blackbox. It's hard to debug especially when rosetta-cli exited with an error.

Solution

This PR annotates errors in package reconciler with stack trace. All behaviors should remain the same. User of this SDK can now print out stack trace through fmt.Printf("%+v", err)

Future Work

• Use similar mechanism for other packages
• Refactor this when Go2 comes out which should drastically change on how error handling works

[coveralls]

Pull Request Test Coverage Report for Build 14403

• 36 of 55 (65.45%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.008%) to 77.914%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
reconciler/reconciler.go	36	55	65.45%

Totals
Change from base Build 14250:	-0.008%
Covered Lines:	8283
Relevant Lines:	10631

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💛 - Coveralls

[septerr]

I think this should be return zeroString, "", 0, errors.Wrapf(err, "%v: %v", ErrGetCurrentBlockFailed.Error(), err.Error()).

This will make sure we are wrapping the err and getting its stack trace. And we use ErrGetCurrentBlockFailed only for the error message.