[LMI-0001] Add Component-Based Metrics & Dynamic Label Support

[tommynguyen-vungle]

This PR introduces the ability to track metric by component (e.g., Kafka, Prometheus). It replaces static metrics with dynamic labels, enabling granular insights into trends across different components.

Key Changes

1. New Feature: Dynamic Prometheus labels based on Jira components.
   • Metrics now include a component label (e.g., jira_deployments_weekly{component="Kafka"}).
2. Code Refactoring:
   • Introduced GaugeVec to support dynamic labels.
   • Added Jira API response types (Issue, Component, JiraResponse) for structured data handling.
3. Error Handling: Removed goto statements and improved error logging.
4. Configuration Update:
   • Added support for dynamic labels in config.yaml (set component: "" to enable).
   • Example JQL now filters by component.

Usage Example

After deploying, the following metrics will be exposed:

# HELP jira_deployments_weekly Weekly deployments count by component  
# TYPE jira_deployments_weekly gauge  
jira_foo{component="Kafka"} 12  
jira_foo{component="Prometheus"} 7