feat: add logger

[songzhibin97]

Summary by CodeRabbit

• New Features
  • Introduced a structured logging system that standardizes error reporting across critical operations. Log messages now include configurable levels, multiple output formats (such as JSON and text), and contextual details like trace identifiers for improved diagnostics and monitoring.

[coderabbitai[bot]]

Walkthrough

The pull request updates client components to replace standard output error messages with structured logging. In both client files, error handling is modified to use calls from the new logger package rather than printing errors directly. Additionally, a new logging package is introduced that provides a configurable logger with multiple severity levels, context support, and helper methods, along with an accompanying suite of unit tests to verify its functionality, configuration loading from files and environment variables, and output formatting.

Changes

File(s)	Change Summary
client/sse.go, client/stdio.go	Modified error handling: replaced standard output error messages with structured logging via the imported logger package.
logger/logger.go, logger/logger_test.go	Added a new logging package that includes a configurable logger with various logging methods and context support, plus unit tests to validate configuration loading and log output.

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