feat(Picker): add readonly prop

[chenjiahan]

#7070

[codecov-commenter]

Codecov Report

Merging #7105 into dev will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              dev    #7105      +/-   ##
==========================================
+ Coverage   91.27%   91.31%   +0.04%     
==========================================
  Files         176      177       +1     
  Lines        4743     4757      +14     
  Branches      280      284       +4     
==========================================
+ Hits         4329     4344      +15     
+ Misses        378      377       -1     
  Partials       36       36              

Impacted Files	Coverage Δ
src/icon/index.tsx	91.66% <ø> (ø)
src/picker/index.js	100.00% <ø> (ø)
src/picker/shared.ts	100.00% <ø> (ø)
src/field/index.js	99.47% <100.00%> (+<0.01%)	⬆️
src/form/index.js	100.00% <100.00%> (ø)
src/picker/PickerColumn.js	90.99% <100.00%> (+1.46%)	⬆️
src/tabbar/index.js	94.11% <100.00%> (+0.36%)	⬆️
src/tabs/index.js	81.08% <100.00%> (-1.42%)	⬇️
src/toast/index.js	98.50% <100.00%> (+0.02%)	⬆️
src/utils/interceptor.ts	100.00% <100.00%> (ø)
... and 3 more

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