Use CustomURLClassLoader to load compiler plugins

[azinneera]

Purpose

Related to #43838 (comment)

Check List

• Read the Contributing Guide
• 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]

Codecov Report

Attention: Patch coverage is 12.50000% with 7 lines in your changes missing coverage. Please review.

Project coverage is 75.05%. Comparing base (006eb9d) to head (19a28a5).
Report is 60 commits behind head on master.

Files with missing lines	Patch %	Lines
.../src/main/java/io/ballerina/cli/launcher/Main.java	0.00%	6 Missing ⚠️
...a/io/ballerina/cli/launcher/util/BalToolsUtil.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #43886      +/-   ##
============================================
- Coverage     75.06%   75.05%   -0.01%     
+ Complexity    57516    57510       -6     
============================================
  Files          3540     3540              
  Lines        222373   222371       -2     
  Branches      28835    28835              
============================================
- Hits         166922   166910      -12     
- Misses        46184    46192       +8     
- Partials       9267     9269       +2     

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