feat: Adding egyptian fractions and support for glyphs

[albertodev01]

Why?

In this PR I'm adding support for egyptian fractions and an improved parsing logic to also support fraction glyphs.

What?

• Creation of the EgyptianFraction class
• Creation of a function to encode/decode fractions from glyphs

Types of Changes

• New feature (non-breaking change which adds functionality)
• Documentation change (change to update documentation)

Notes

Thanks to @doppio for the contribution on glyphs conversions! 😄

Checklist

• I have provided a description of the proposed changes.
• I added unit tests for all relevant code.
• I added golden tests for all UI changes.
• I added documentation for all relevant code.

[codecov]

Codecov Report

Merging #9 (29f24bc) into master (d53081d) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##            master        #9    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files            7         8     +1     
  Lines          199       299   +100     
==========================================
+ Hits           199       299   +100     

Impacted Files	Coverage Δ
lib/src/core.dart	100.00% <100.00%> (ø)
lib/src/egyptian.dart	100.00% <100.00%> (ø)
lib/src/extensions/fraction_string.dart	100.00% <100.00%> (ø)
lib/src/extensions/mixed_string.dart	100.00% <100.00%> (ø)
lib/src/mixed.dart	100.00% <100.00%> (ø)

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[albertodev01]

@doppio done! Your PR is part of the 3.0.0 version that will be published in a moment 😄