add map examples

[yunwei37]

Description

• add examples for maps
• add ci in test
• refactor error message

[codecov]

Codecov Report

Attention: Patch coverage is 60.97561% with 16 lines in your changes missing coverage. Please review.

Project coverage is 81.00%. Comparing base (81a6998) to head (cc96db5).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/compiler.cpp	50.00%	12 Missing ⚠️
src/llvm_jit_context.cpp	25.00%	3 Missing ⚠️
src/vm.cpp	92.30%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #14      +/-   ##
==========================================
+ Coverage   78.34%   81.00%   +2.65%     
==========================================
  Files          10        5       -5     
  Lines        1136      979     -157     
  Branches      115      102      -13     
==========================================
- Hits          890      793      -97     
+ Misses        246      186      -60     

Flag	Coverage Δ
bpf_conformance	67.00% <31.70%> (+5.38%)	⬆️
unittests	56.17% <46.34%> (+5.16%)	⬆️

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