chore: renaming file names for functions and tests

[sliedig]

Issue number:
#32

Summary

Updated file names to match those of other runtimes.

Changes

Function files have been renamed to include _function or _event_handler to match files in other runtimes such as .NET

User experience

Please share what the user experience looks like before and after this change
No functional changes were introduced

Checklist

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• I have performed a self-review of this change
• Changes have been tested
• Changes are documented
• PR title follows conventional commit semantics

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