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

[longyue0521]

1. 新增question issue模版,自动打标签为question
2. 修改proposal issue模版中标签名使其与github上创建的标签相同

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (3b8df59) 77.56983% compared to head (3ecede5) 77.82123%.

Additional details and impacted files

@@                 Coverage Diff                 @@
##                main         #15         +/-   ##
===================================================
+ Coverage   77.56983%   77.82123%   +0.25140%     
===================================================
  Files             45          45                 
  Lines           3580        3580                 
===================================================
+ Hits            2777        2786          +9     
+ Misses           587         581          -6     
+ Partials         216         213          -3     

Flag	Coverage Δ
unittests	77.82123% <ø> (+0.25140%)	⬆️

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see 3 files with indirect coverage changes

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[WineChord]

LGTM

[WineChord]

@longyue0521 do you consider adding these patches to the main trpc-go repo?