feat(hz): optional filed parse for client

[FGYFFFF]

What type of PR is this?

feat

Check the PR title.

• [ ] This PR title match the format: \<type>(optional scope): \<description>
• [ ] The description of this PR title is user-oriented and clear enough for others to understand.
• [ ] Attach the PR updating the user documentation if the current PR requires user awareness at the usage level. User docs repo 针对 hz client，对 optional 字段进行处理，如果用户不设置对应值，则不传这个值

(Optional) Translate the PR title into Chinese.

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en: optional filed parse for client zh(optional):

(Optional) Which issue(s) this PR fixes:

(Optional) The PR that updates user documentation:

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 82.86%. Comparing base (dbd3166) to head (122001c). Report is 10 commits behind head on develop.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #1177 +/- ## =========================================== + Coverage 82.61% 82.86% +0.25% =========================================== Files 123 124 +1 Lines 11455 11695 +240 =========================================== + Hits 9463 9691 +228 - Misses 1419 1431 +12 Partials 573 573 ``` | [Flag](https://app.codecov.io/gh/cloudwego/hertz/pull/1177/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cloudwego) | Coverage Δ | | |---|---|---| | [](https://app.codecov.io/gh/cloudwego/hertz/pull/1177/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cloudwego) | `82.86% <ø> (?)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cloudwego#carryforward-flags-in-the-pull-request-comment) to find out more.

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