feat add ipmi component

[parsa97]

PR Description

This PR adds a new prometheus.exporter.ipmi component to Grafana Alloy for collecting hardware metrics from IPMI-enabled devices.

Key Features:

• Local IPMI Collection: Monitor the local machine's IPMI interface using FreeIPMI tools
• Remote IPMI Monitoring: Monitor network-accessible IPMI devices with authentication support
• Multiple Target Support: Configure multiple remote targets with individual credentials
• Authentication Options: Supports user/password authentication with configurable driver (LAN_2_0/LAN) and privilege levels (user/admin)
• Configurable Timeout: Adjustable timeout for IPMI sensor collection (default: 30 seconds)
• Module Configuration: Support for custom collector modules via inline config or external file

Implementation Details:

• Component: internal/component/prometheus/exporter/ipmi/
• Integration: internal/static/integrations/ipmi_exporter/
• Dependencies: Uses github.com/bougou/go-ipmi for IPMI operations

Which issue(s) this PR fixes

Fixes #731

Notes to the Reviewer

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PR Checklist

• CHANGELOG.md updated
• Documentation added
• Tests updated
• Config converters updated

[CLAassistant]

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