adding rankMethod parameter to fallback transport

[0x33dm]

This is a PR attempting to address the issue highlighted here: #2540

Unfortunately, I didn't get around to running the tests and making it work.

I left a half-written test in there and would appreciate if someone could help writing that test.

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PR-Codex overview

The focus of this PR is to add a rankMethod option for custom transport ranking in the fallback system.

Detailed summary

• Added rankMethod option for custom ranking method in transport fallback
• Updated rankTransports function to support custom ranking method
• Implemented custom ranking method usage in transport ranking algorithm

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