feat(stream): add debug logs for join key with high amplification

[kwannoel]

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What's changed and what's your intention?

Adapted from @yuhao-su's commit 4132bee, so we can have a general mechanism to debug this case.

It can be enabled with RUST_LOG="hash_join_amplification=debug"

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[stdrc]

LGTM

[lmatz]

do you want to include it into v1.9.0, we still got some time before releasing it today

[kwannoel]

do you want to include it into v1.9.0, we still got some time before releasing it today

Hmm okay we can merge it in first.