test(connector): add benchmark for parsing combined (struct type) nexmark events

[BugenZhao]

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What's changed and what's your intention?

Add a new benchmark function in nexmark_integration.rs that takes combined events as input, where each event is represented with a single composed struct field.

This covers the real path of our nexmark benchmark, as described in #17153 (comment).

Here's a snapshot of the current performance (with LTO off):

parse_nexmark           time:   [19.251 ms 19.297 ms 19.348 ms]

parse_nexmark_with_tracing
                        time:   [19.268 ms 19.342 ms 19.426 ms]

parse_nexmark_struct_type
                        time:   [28.135 ms 28.340 ms 28.547 ms]

Checklist

• I have written necessary rustdoc comments
• I have added necessary unit tests and integration tests
• All checks passed in ./risedev check (or alias, ./risedev c)

Documentation

• My PR needs documentation updates. (Please use the Release note section below to summarize the impact on users)

Release note

If this PR includes changes that directly affect users or other significant modifications relevant to the community, kindly draft a release note to provide a concise summary of these changes. Please prioritize highlighting the impact these changes will have on users.

[BugenZhao]

• test(connector): add benchmark for parsing combined (struct type) nexmark events #17189 👈
• main

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