docs: fix label name in 03-proposal.md and add question issue template

[longyue0521]

@WineChord

1. 需要有权限的小伙伴添加proposal标签
2. 添加question issue模版,自动打question标签

[github-actions[bot]]

CLA Assistant Lite bot All contributors have signed the CLA ✍️ ✅

[longyue0521]

I have read the CLA Document and I hereby sign the CLA

[codecov[bot]]

Codecov Report

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

Comparison is base (1536955) 85.54052% compared to head (3be522d) 85.60879%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #125 +/- ## =================================================== + Coverage 85.54052% 85.60879% +0.06826% =================================================== Files 188 188 Lines 16114 16114 =================================================== + Hits 13784 13795 +11 + Misses 1771 1756 -15 - Partials 559 563 +4 ``` | [Flag](https://app.codecov.io/gh/trpc-group/trpc-go/pull/125/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=trpc-group) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/trpc-group/trpc-go/pull/125/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=trpc-group) | `85.60879% <ø> (+0.06826%)` | :arrow_up: | 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=trpc-group#carryforward-flags-in-the-pull-request-comment) to find out more. [see 3 files with indirect coverage changes](https://app.codecov.io/gh/trpc-group/trpc-go/pull/125/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=trpc-group)

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