feat: implement log grouping for better output

[jaxxstorm]

Fixes #293

[Copilot]

Pull request overview

This PR adds a configurable logging mode to improve GitHub Actions output readability by grouping major phases, while also enabling quieter or ungrouped output depending on user preference.

Changes:

• Introduces a log-mode input (grouped/normal/quiet) and threads it through setup and cleanup execution paths.
• Wraps major setup/cleanup phases in GitHub Actions log groups when log-mode=grouped.
• Centralizes routine logging behind logInfo/logDebug helpers and updates command execution logging to respect the selected mode.

Reviewed changes

Copilot reviewed 4 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/main.ts	Adds LogMode, log helpers, grouping wrapper, and propagates log mode through setup/install/connect/status/ping flows.
src/logout/logout.ts	Adds LogMode handling and wraps post-job cleanup in a log group while respecting quiet/normal modes.
README.md	Documents the new log-mode input and its supported values.
action.yml	Adds the log-mode input with default grouped.
dist/index.js	Updates compiled action entrypoint to include log-mode behavior and grouping.
dist/logout/index.js	Updates compiled post action to include log-mode behavior and grouping.

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