Add monitor variables

[GabrielSalla]

No description provided.

[Copilot]

Pull Request Overview

This pull request introduces monitor variable support by adding new functions to set and get monitor-specific variables and updating the monitor configuration with identification attributes. Key changes include:

• Adding the functions set_variable and get_variable along with comprehensive tests.
• Updating the monitor configuration (_configure_monitor) to set SENTINELA_MONITOR_ID, SENTINELA_MONITOR_NAME, and SENTINELA_MONITOR_PATH.
• Adding a migration for the new Variables table and updating documentation to describe the usage of these functions.

Reviewed Changes

Copilot reviewed 15 out of 15 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tests/utils/test_stack.py	Added tests to validate the get_caller behavior.
tests/sample_monitor_code.py	Introduced a new call_function helper for asynchronous execution within monitors.
tests/monitor_utils/test_variables.py	Added tests covering various scenarios for setting and retrieving monitor variables.
tests/models/test_variable.py	Added tests to verify the Variable model’s set method and timestamp updates.
tests/conftest.py	Updated monitor fixture to set new monitor identification attributes.
tests/components/monitors_loader/test_monitors_loader.py	Updated tests to reflect changes in monitor configuration parameters.
src/utils/stack.py	Added the get_caller function with detailed stack logging.
src/monitor_utils/variables.py	Implemented set_variable and get_variable functions that rely on get_caller.
src/components/monitors_loader/monitors_loader.py	Modified _configure_monitor to accept and assign monitor identification attributes.
migrations/versions/…_create_variables_table.py	Introduced a migration to create the Variables table.
docs/monitor.md	Expanded documentation with a new section for monitor variables.