Feat: enhance cue tostring

[Somefive]

Signed-off-by: Yin Da yd219913@alibaba-inc.com

[codecov]

Codecov Report

Base: 90.71% // Head: 90.61% // Decreases project coverage by -0.11% ⚠️

Coverage data is based on head (fb5df60) compared to base (aa748fa).
Patch coverage: 88.88% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #41      +/-   ##
==========================================
- Coverage   90.71%   90.61%   -0.11%     
==========================================
  Files          51       52       +1     
  Lines        1604     1672      +68     
==========================================
+ Hits         1455     1515      +60     
- Misses        108      113       +5     
- Partials       41       44       +3     

Flag	Coverage Δ
unit-test	90.61% <88.88%> (-0.11%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
util/stringtools/format.go	81.25% <81.25%> (ø)
cue/cuex/compiler.go	83.01% <90.62%> (+2.75%)	⬆️
cue/util/string.go	82.14% <90.90%> (+19.64%)	⬆️
cue/cuex/runtime/provider.go	86.66% <100.00%> (+0.62%)	⬆️

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