refactor: generate rust tests for code snippets in book

[baszalmstra]

Started working on improving the testability of our book before I add a lot of content to it. Not sure if you are doing the same @Wodann?

[codecov]

Codecov Report

Merging #311 (221b796) into master (aece59e) will decrease coverage by 0.20%.
The diff coverage is 34.44%.

❗ Current head 221b796 differs from pull request most recent head 7304496. Consider uploading reports for the commit 7304496 to get more accurate results

@@            Coverage Diff             @@
##           master     #311      +/-   ##
==========================================
- Coverage   80.80%   80.59%   -0.21%     
==========================================
  Files         258      259       +1     
  Lines       15480    15561      +81     
==========================================
+ Hits        12508    12541      +33     
- Misses       2972     3020      +48     

Impacted Files	Coverage Δ
crates/mun_compiler/src/driver/config.rs	100.00% <ø> (ø)
crates/mun_compiler_daemon/src/lib.rs	0.00% <0.00%> (ø)
crates/mun_skeptic/src/lib.rs	0.00% <0.00%> (ø)
crates/mun_test/src/driver.rs	80.00% <70.00%> (+6.02%)	⬆️
crates/mun_compiler/src/driver.rs	59.16% <78.57%> (+0.83%)	⬆️
crates/mun_skeptic/src/runtime.rs	88.00% <88.00%> (ø)
crates/mun/src/ops/build.rs	77.58% <88.23%> (+0.22%)	⬆️
crates/mun_compiler/src/diagnostics.rs	100.00% <100.00%> (ø)
crates/mun_compiler/src/lib.rs	71.05% <100.00%> (ø)
crates/mun_runtime_capi/src/tests.rs	99.49% <100.00%> (+<0.01%)	⬆️
... and 6 more

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