🩹 use arg.get in get_abi_input_names and get_abi_output_names

[DavidRomanovizc]

What was wrong?

Raised KeyError exception when name field not in ABIComponent

Related to Issue #297
Closes #297

How was it fixed?

Replace arg["name"] with arg.get("name")

And I think we need to update ABIElement in eth-typing because names are optional

Todo:

• Clean up commit history
• Add or update documentation related to these changes
• Add entry to the release notes

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