[WJ-1060] Avoid exponential parsing of nested unclosed blocks

[jsthope]

see WJ-1060

This PR improves handling of malformed and unclosed blocks by memoizing terminal EndOfInput failures for block and block-star rules.
And by including relevant parser state in the cache key including bibliography state.

[codecov]

Codecov Report

❌ Patch coverage is 95.34884% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.40%. Comparing base (782ce11) to head (655243d).

Files with missing lines	Patch %	Lines
src/parsing/parser.rs	93.93%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #129      +/-   ##
==========================================
+ Coverage   71.17%   71.40%   +0.22%     
==========================================
  Files         220      220              
  Lines        6234     6266      +32     
==========================================
+ Hits         4437     4474      +37     
+ Misses       1797     1792       -5     

Flag	Coverage Δ		*Carryforward flag
ftml	64.39% <ø> (ø)		Carriedforward from 6018e60

*This pull request uses carry forward flags. Click here to find out more.

Files with missing lines	Coverage Δ
src/parsing/rule/mod.rs	73.33% <100.00%> (+8.11%)	⬆️
src/tree/bibliography.rs	50.00% <100.00%> (+2.50%)	⬆️
src/parsing/parser.rs	87.54% <93.93%> (+1.38%)	⬆️

... and 11 files with indirect coverage changes

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[emmiegit]

Good enhancements! I had a few comments.