add tests for producer

[Gsantomaggio]

This PR adds more tests for the producer when:

• try to use the same id
• try to close twice
• try to use it after close
• test the deduplication with send batch

There is a commented test:

producer_deduplication_send_after_close_error

because it does not work like the producer I will check it and open another PR

[codecov[bot]]

Codecov Report

Patch coverage has no change and project coverage change: +0.52 :tada:

Comparison is base (fd46a39) 87.29% compared to head (3a819ef) 87.81%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #177 +/- ## ========================================== + Coverage 87.29% 87.81% +0.52% ========================================== Files 68 68 Lines 5516 5516 ========================================== + Hits 4815 4844 +29 + Misses 701 672 -29 ``` [see 5 files with indirect coverage changes](https://app.codecov.io/gh/rabbitmq/rabbitmq-stream-rust-client/pull/177/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=rabbitmq)

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Do you have feedback about the report comment? Let us know in this issue.