Improve fuzzer_driver.cpp to read the test case file

Description

In https://github.com/unicode-org/icu/commit/1606c4c58693c2f2423aaef7250cc26e59476982
test/fuzzer/fuzzer_driver.cpp is added to always call LLVMFuzzerTestOneInput with abc123. We should improve this to at least pass in the content of the file so we can debug problem easier.

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Reporter

Frank Yung-Fong Tang

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