Complement the syntax of break and continue statement

[Sway007]

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• Tests for the changes have been added (for bug fixes / features)
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What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

Complement the syntax of break and continue statement

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.05% 🎉

Comparison is base (16f8f2c) 65.13% compared to head (7cf24e3) 65.19%.

❗ Current head 7cf24e3 differs from pull request most recent head 8c2197a. Consider uploading reports for the commit 8c2197a to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1789      +/-   ##
==========================================
+ Coverage   65.13%   65.19%   +0.05%     
==========================================
  Files         473      473              
  Lines       23641    23663      +22     
  Branches     3362     3362              
==========================================
+ Hits        15399    15427      +28     
+ Misses       7036     7033       -3     
+ Partials     1206     1203       -3     

Files Changed	Coverage Δ
packages/shader-lab/src/ShaderVisitor.ts	87.50% <100.00%> (+0.43%)	⬆️
packages/shader-lab/src/ast-node/AstNode.ts	81.86% <100.00%> (+0.31%)	⬆️
packages/shader-lab/src/parser/ShaderParser.ts	98.80% <100.00%> (+0.01%)	⬆️
...kages/shader-lab/src/parser/tokens/GLSLKeywords.ts	100.00% <100.00%> (ø)

... and 2 files with indirect coverage changes

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