Feat: support raw extension for extra data in cuex

[FogDong]

Signed-off-by: FogDong dongtianxin.tx@alibaba-inc.com

[codecov]

Codecov Report

Base: 90.71% // Head: 90.66% // Decreases project coverage by -0.05% ⚠️

Coverage data is based on head (5dac85b) compared to base (aa748fa).
Patch coverage: 90.24% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #42      +/-   ##
==========================================
- Coverage   90.71%   90.66%   -0.05%     
==========================================
  Files          51       52       +1     
  Lines        1604     1682      +78     
==========================================
+ Hits         1455     1525      +70     
- Misses        108      113       +5     
- Partials       41       44       +3     

Flag	Coverage Δ
unit-test	90.66% <90.24%> (-0.05%)	⬇️

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Impacted Files	Coverage Δ
util/stringtools/format.go	81.25% <81.25%> (ø)
cue/util/string.go	82.14% <90.90%> (+19.64%)	⬆️
cue/cuex/compiler.go	84.48% <92.85%> (+4.21%)	⬆️
cue/cuex/runtime/provider.go	86.66% <100.00%> (+0.62%)	⬆️

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