ICU-22549 Add DateTimePatternGenerator fuzzer

[FrankYFTang]

Checklist

• Required: Issue filed: https://unicode-org.atlassian.net/browse/ICU-22549
• Required: The PR title must be prefixed with a JIRA Issue number.
• Required: The PR description must include the link to the Jira Issue, for example by completing the URL in the first checklist item
• Required: Each commit message must be prefixed with a JIRA Issue number.
• Issue accepted (done by Technical Committee after discussion)
• Tests included, if applicable
• API docs and/or User Guide docs changed or added, if applicable

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[jira-pull-request-webhook]

Notice: the branch changed across the force-push!

• icu4c/source/test/fuzzer/date_time_pattern_generator_fuzzer.cpp is different

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[richgillam]

I'll accept that. Thank you for the addition.

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Notice: the branch changed across the force-push!

• icu4c/source/test/fuzzer/Makefile.in is different

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[richgillam]

What changed since the last time I approved this?

[FrankYFTang]

just resolve merge conflict

[richgillam]

What changed since the last time I approved this?

just resolve merge conflict

Okay. Approved again.

[FrankYFTang]

Sorry, my commit message is bad. I need to resquash it again

[jira-pull-request-webhook]

Hooray! The files in the branch are the same across the force-push. 😃

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[richgillam]

Still looks good. :-)