Change the extended library word to Ballerina library

[praneesha]

Purpose

Change the extended library word to Ballerina library.

Examples

Checklist

• Linked to an issue
• Updated the specification
• Updated the changelog
• Added tests
• Checked native-image compatibility

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (c79beb0) 82.25% compared to head (113fc95) 82.25%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #761   +/-   ##
=========================================
  Coverage     82.25%   82.25%           
  Complexity      194      194           
=========================================
  Files            17       17           
  Lines           885      885           
  Branches        163      163           
=========================================
  Hits            728      728           
  Misses           85       85           
  Partials         72       72           

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