feat: make height width non required

[bharat-1809]

Overview

Fixes: #10

• Make the height and width param un-required.
• Update tests
• Update example to handle the added feature

[codecov]

Codecov Report

Attention: Patch coverage is 93.61702% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 83.33%. Comparing base (daa6c30) to head (bce5916).

❗ Current head bce5916 differs from pull request most recent head 31806b3

Please upload reports for the commit 31806b3 to get more accurate results.

Files	Patch %	Lines
lib/src/glass_container.dart	92.68%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #38      +/-   ##
==========================================
+ Coverage   81.56%   83.33%   +1.77%     
==========================================
  Files           2        3       +1     
  Lines         141      156      +15     
==========================================
+ Hits          115      130      +15     
  Misses         26       26              

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