Add block explorer link to transaction output

[chasefleming]

Closes #1791

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For contributor use:

• Targeted PR against master branch
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work
• Code follows the standards mentioned here
• Updated relevant documentation
• Re-reviewed Files changed in the Github PR explorer
• Added appropriate labels

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 87.50000% with 4 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
internal/transactions/transactions.go	84.00%	4 Missing ⚠️

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