Fix preprocessing leaves unnecessary lifetimes

[haydenhoang]

Change Summary

This PR made changes to the preprocessing script to fix issue #65.

Only request models and models in this list are made to use Cow, not models that are BOTH request and response.

PR Checklist

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[RoDmitry]

Looks good. But I guess the meaning of x-rust-has-borrowed-data has changed. Previously it was mainly set to objects which contained strings, but what does it mean now? Why is it set to each string? Maybe rename so it would be meaningful?

[RoDmitry]

Still does not look right:
https://github.com/haydenhoang/typesense-rust/blob/693c567711cb5bb988ae29b359e9a7b8dccc4d06/preprocessed_openapi.yml#L101
https://github.com/haydenhoang/typesense-rust/blob/693c567711cb5bb988ae29b359e9a7b8dccc4d06/preprocessed_openapi.yml#L174
https://github.com/haydenhoang/typesense-rust/blob/693c567711cb5bb988ae29b359e9a7b8dccc4d06/preprocessed_openapi.yml#L203
https://github.com/haydenhoang/typesense-rust/blob/693c567711cb5bb988ae29b359e9a7b8dccc4d06/preprocessed_openapi.yml#L604
and many more.

Is it used at all when set to a string type?
If so, maybe rename to something like x-rust-has-lifetime for example, which would be easier to understand.

[haydenhoang]

I have removed the remaining unnecessary flags and also changed the name to x-rust-has-lifetime.

Edit: wait, look like there are still some unnecessary flags left, let me take a look...

[haydenhoang]

Done.