CFF: Support for FD Select, Format 0

[brianpopow]

Prerequisites

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

Description

This PR adds support for parsing FD Select format 0 for Compact Font Format as described in the spec page 29, table 27.

[codecov[bot]]

Codecov Report

Merging #286 (99ddb66) into main (863ac8c) will increase coverage by 0%. The diff coverage is 77%.

@@          Coverage Diff          @@
##            main    #286   +/-   ##
=====================================
  Coverage     83%     83%           
=====================================
  Files        222     222           
  Lines      12199   12211   +12     
  Branches    1759    1761    +2     
=====================================
+ Hits       10159   10191   +32     
+ Misses      1610    1591   -19     
+ Partials     430     429    -1     

Flag	Coverage Δ
unittests	83% <77%> (+<1%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/SixLabors.Fonts/Tables/Cff/FDRangeProvider.cs	77% <73%> (+1%)	:arrow_up:
src/SixLabors.Fonts/Tables/Cff/CffParser.cs	69% <85%> (+4%)	:arrow_up:
src/SixLabors.Fonts/Tables/Cff/CidFontInfo.cs	100% <100%> (ø)
.../SixLabors.Fonts/Tables/Cff/CffEvaluationEngine.cs	54% <0%> (+2%)	:arrow_up:

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