test: extended client action composition

[holic]

I wanted to know how client extending/action composition was meant to work, so I wrote a test to demonstrate since it doesn't seem to be documented anywhere.

(This is my assumed behavior and the test confirms it!)

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PR-Codex overview

The focus of this PR is to add a test for action composition in the createClient function.

Detailed summary

• Added a test for action composition in createClient
• Imported getChainId function for testing
• Added getAction utility function for action composition in tests

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