[draft][fix] rewrite completion API to avoid repetitive tokens

[LinPoly]

Description

This PR is fixing the repetitive token issue reported from different sources. For completion API, there maybe multiple prompts in a same request, so we have multiple RequestOutput, we want to process them ASAP so we launch multiple producer() tasks and put the result into a queue, and then we take the result from the queue with consumer().

The problem here is, there is no coordination between producer and consumer, a producer may put several times before consumer takes, but __anext__() function of RequestOutput returns itself (we call it inside producer and put the result into the queue), which means all the entries refer to the same object, and we basically process the same thing for these entries, then we get repetitive tokens.

The fix is to create a separate task to process each RequestOutput, then merge their result.

Test Coverage

Original test is enough, and completion test passed locally

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[LinPoly]

@Superjomn @kaiyux Do you guys have time to review this PR? I am open to chat/call if necessary.