chore: add events util tests

[lukasaric]

Motivation and Resolution

Write events util tests to improve tests coverage. That includes tests for these utiils:

• - isAbiEvent
• - getAbiEvents
• - parseEvents
• - parseUDCEvent

It resolves: #1217

RPC version (if applicable)

n.a

Usage related changes

n.a

Development related changes

isObject will not be covered here since it is moved to a different util in #1212

Checklist:

• Performed a self-review of the code
• Rebased to the last commit of the target branch (or merged it into my branch)
• Linked the issues which this PR resolves
• Documented the changes in code (API docs will be generated automatically)
• Updated the tests
• All tests are passing