Watchdog service

[droserasprout]

No description provided.

[Copilot]

Pull Request Overview

This PR introduces a configurable watchdog service to monitor long‐running callbacks, transactions, and other activities. Key changes include:

• A new watchdog module with Watchdog and WatchdogManager classes to manage heartbeat and timeout events.
• Integration of the watchdog service into transactions, context callbacks, and configuration with new schema and documentation updates.
• Updates to related modules (models, exceptions, config, docs, etc.) to support and document the new watchdog functionality.

Reviewed Changes

Copilot reviewed 21 out of 21 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/dipdup/watchdog.py	New watchdog service implementation with heartbeat and timeout checks.
src/dipdup/transactions.py	Added calls to watchdog.heartbeat and watchdog.reset in transaction flow.
src/dipdup/models/init.py	Updated enum usage for index models for consistency.
src/dipdup/dipdup.py	Integrated watchdog configuration into process management and background tasks.
src/dipdup/context.py	Exposed watchdog property in the context for global accessibility.
src/dipdup/config/init.py	Updated config definitions to include watchdog triggers and actions.
docs and schema files	Updated documentation and JSON schema to reflect the new watchdog service.
CHANGELOG.md	Changelog entry for the new configurable watchdog service.