Break Change: drop ast.Node API `UnsafeArray()` and `UnsafeMap()`

[AsterDY]

Reason: PR #464 changed the underlying storage of ast.Node, thus we can provide directly reference of it like UnsafeArray() and UnsafeMap(). For safety , we dropped these two API

[codecov-commenter]

Codecov Report

Merging #498 (e36a683) into main (007f4ff) will decrease coverage by 0.86%. The diff coverage is n/a.

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@@            Coverage Diff             @@
##             main     #498      +/-   ##
==========================================
- Coverage   73.70%   72.85%   -0.86%     
==========================================
  Files          58       60       +2     
  Lines        8021     8016       -5     
==========================================
- Hits         5912     5840      -72     
- Misses       1789     1859      +70     
+ Partials      320      317       -3     

Files Changed	Coverage Δ
ast/node.go	79.73% <ø> (-0.35%)	:arrow_down:

... and 16 files with indirect coverage changes

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