feature: update index and add LOG_FORMAT to have json format

[Anmol1696]

No description provided.

[Copilot]

Pull request overview

This PR adds JSON format logging support to the logger package, enabling structured log output for log aggregation tools. The implementation adds a new LOG_FORMAT environment variable that accepts 'pretty' (default) or 'json' values, along with runtime configuration functions.

Changes:

• Added JSON format logging with structured output including timestamp, level, scope, message, and error fields
• Exported additional configuration functions (setLogLevel, setShowTimestamp, setLogFormat, setLogScopes) and types (LogLevel, LogFormat)
• Refactored stream selection to support both pretty and JSON format branches

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 6 comments.

File	Description
pgpm/logger/src/logger.ts	Implements JSON format logging logic with environment variable support and runtime configuration
pgpm/logger/src/index.ts	Exports new configuration functions and types for external use

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