feat(clipper): Implement concurrent file reading and refactor project structure

[supitsdu]

This PR enhances Clipper by introducing concurrent file reading using goroutines and channels in the new cli/reader/reader.go package. It refactors cli/clipper/clipper.go to utilize these improvements, improving performance and maintainability. The test structure is also reorganized for clarity.

Changes

• New cli/reader/reader.go Package:

  • Implements concurrent file reading with goroutines and channels.
  • Introduces ReadContentConcurrently function for efficient file handling.

• Refactored cli/clipper/clipper.go:

  • Updated to leverage cli/reader/reader.go for file reading operations.
  • Enhances code clarity and separation of concerns.

• Enhanced Test Structure:

  • Introduces tests/tests.go for shared testing utilities.
  • Restructures tests into tests/clipper/clipper_test.go and tests/reader/reader_test.go.

Tasks

• [x] Implement concurrent file reading with cli/reader/reader.go.
• [x] Refactor cli/clipper/clipper.go for improved readability and performance.
• [x] Organize tests into dedicated files for better maintainability and focus.
• [x] Benchmark performance improvements with concurrent file reading.
• [x] Document benchmark results and optimizations for future reference.

Next Steps

Upon merging, focus will shift to benchmarking the application to quantify performance gains from concurrent file reading. This will inform future optimizations and enhancements to Clipper's file handling capabilities.

Closes #23