Implement Hebrew and Thai/Lao Font Shapers

[JimBobSquarePants]

Prerequisites

• I have written a descriptive pull-request title
• I have verified that there are no overlapping pull-requests open
• I have verified that I am following matches the existing coding patterns and practice as demonstrated in the repository. These follow strict Stylecop rules 👮.
• I have provided test coverage for my change (where applicable)

Description

Introduces dedicated shapers for Hebrew, Thai and Lao scripts.

In addition, multiple algorithmic optimizations were introduced to improve shaping performance.

[codecov]

Codecov Report

❌ Patch coverage is 40.40115% with 208 lines in your changes missing coverage. Please review.
✅ Project coverage is 82%. Comparing base (ee58d0d) to head (07a5484).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
...s/Tables/AdvancedTypographic/Shapers/ThaiShaper.cs	21%	123 Missing and 2 partials ⚠️
...Tables/AdvancedTypographic/Shapers/HebrewShaper.cs	16%	79 Missing and 3 partials ⚠️
...bors.Fonts/Tables/AdvancedTypographic/GPosTable.cs	0%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@          Coverage Diff           @@
##            main    #509    +/-   ##
======================================
- Coverage     83%     82%    -1%     
======================================
  Files        303     305     +2     
  Lines      21208   21520   +312     
  Branches    3106    3161    +55     
======================================
+ Hits       17691   17797   +106     
- Misses      2715    2916   +201     
- Partials     802     807     +5     

Flag	Coverage Δ
unittests	82% <40%> (-1%)	⬇️

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