Papercut fix: null bytes starting whitespace in sudoers files

[squell]

This is perhaps best reviewed commit by commit.

• First commit unignores the compliance tests
• Second commit fixes the spot where the "illegal escape" error was hidden (which made it harder to find the bug)
• Third commit changes the error into the correct one (escape character is now hardcoded \, no need for a sentinel)
• Fourth commit seems a bit unrelated, but changes the contract of accept_if, which was the only function for which you could rely on an Err result to not have consumed input (which accept_escaped then followed incorrectly) to prevent similar mistakes in the future.

[github-actions]

Number of dependencies and binary size impact report

Metric	main	PR #751	Delta
Direct dependencies	3	3	-
Total dependencies	4	4	-
Binary size	1 MiB	1023.9 KiB	-0.5%
Text size	597.6 KiB	593.6 KiB	-0.7%

Dependencies diff

 └─ sudo-rs [v0.2.0]
    ├─ glob [v0.3.1]
    ├─ libc [v0.2.147]
    └─ log [v0.4.20]

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.02% 🎉

Comparison is base (0ac6fa8) 54.86% compared to head (aaf4b7d) 54.88%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #751      +/-   ##
==========================================
+ Coverage   54.86%   54.88%   +0.02%     
==========================================
  Files          71       71              
  Lines        9731     9736       +5     
==========================================
+ Hits         5339     5344       +5     
  Misses       4392     4392              

Files Changed	Coverage Δ
src/sudoers/tokens.rs	96.42% <ø> (ø)
src/sudoers/ast.rs	82.76% <100.00%> (ø)
src/sudoers/basic_parser.rs	94.73% <100.00%> (+0.02%)	⬆️
src/sudoers/test/mod.rs	92.82% <100.00%> (+0.07%)	⬆️

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