Go Network Filter: support enableHalfClose for upstream connection

[duxin40]

In summary This PR will add the support to enableHalfClose for upstream connection in go network filter, if user set enableHalfClose to true, reading a remote upstream half-close will not fully close the connection.

Future Plan support for go network filter can be configured together with HCM, so user can specify upstream conn enableHalfClose on L4 and manage traffic on L7.

Let me know if this sounds reasonable, and thank you all for the review!

Commit Message: Additional Description: Risk Level: Testing: Docs Changes: Release Notes: Platform Specific Features: [Optional Runtime guard:] [Optional Fixes #Issue] [Optional Fixes commit #PR or SHA] [Optional Deprecated:] [Optional API Considerations:]

[repokitteh-read-only[bot]]

Hi @duxin40, welcome and thank you for your contribution.

We will try to review your Pull Request as quickly as possible.

In the meantime, please take a look at the contribution guidelines if you have not done so already.

:cat:

Caused by: https://github.com/envoyproxy/envoy/pull/34196 was opened by duxin40. see: [more](https://github.com/envoyproxy/envoy/pull/34196), [trace](https://prod.repokitteh.app/traces/ui/envoyproxy/envoy/8c067d20-1358-11ef-9aae-c9ecc1bfa9fb).

[doujiang24]

Thanks @duxin40 , looks good after a quick look, will take a deep look soon.

[duxin40]

@doujiang24 sorry for clicking on the button (request for review) 😂, could you please help approve again~

[doujiang24]

Thanks @zuercher , as extension maintainer does not have permission to merge/approve, please help to merge it manually, thanks very much :)

[doujiang24]

cc @wbpcode @phlax Thanks~