Remove unused encoding module dependencies

[ldclakmal]

Purpose

The PR #18309 removes the redundant APIs of ballerina/encoding module, with the newly introduced APIs of langlib/array and langlib/string.

As of now, ballerina/encoding is used by only ballerina/jwt and ballerina/websub modules. This PR removes the unused dependencies of the ballerina/encoding module.

Check List

• Read the Contributing Guide
• Required Balo version update
• Updated Change Log
• Checked Tooling Support (#)
• Added necessary tests
  • Unit Tests
  • Spec Conformance Tests
  • Integration Tests
  • Ballerina By Example Tests
• Increased Test Coverage
• Added necessary documentation
  • API documentation
  • Module documentation in Module.md files
  • Ballerina By Examples

[codecov-io]

Codecov Report

Merging #18619 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #18619   +/-   ##
=======================================
  Coverage   15.15%   15.15%           
=======================================
  Files          48       48           
  Lines        1254     1254           
  Branches      197      197           
=======================================
  Hits          190      190           
  Misses       1050     1050           
  Partials       14       14

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