[ECOINT-305] Add live bandwidth metric and update dashboard layout

[BartoszBlizniak]

What does this PR do?

A brief description of the change being made with this pull request.
This pull request introduces Cloudsmith integration version 0.0.3, focusing on enhanced quota usage visualization and the addition of real-time bandwidth metrics. The dashboard has been significantly upgraded to support historical tracking and near real-time monitoring, with improved documentation and configuration options. The most important changes are grouped below:

Dashboard and Visualization Enhancements

• Added historical (time series and bar) widgets to the dashboard for daily storage and bandwidth quota percentages, enabling day-over-day trend tracking alongside current value widgets. [1] [2]
• Updated dashboard to include a real-time bandwidth interval bytes metric (cloudsmith.bandwidth_bytes_interval) and corresponding widgets for near real-time traffic visibility. [1] [2]

Metrics and Configuration

• Introduced real-time bandwidth metric using the Cloudsmith v2 analytics endpoint, configurable via the new enable_realtime_bandwidth option in cloudsmith.yaml, with internal defaults for simplicity. [1] [2] [3]
• Updated documentation to clarify the daily update cadence of quota-based metrics and recommended best practices for historical visualization. [1] [2] [3]

Internal Improvements and Versioning

• Real-time implementation now uses per-instance state for reliability across Agent restarts, and tests have been updated for analytics response and emission logic. Also includes style fixes in check.py.
• Bumped integration version to 0.0.3.

Motivation

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Review checklist

• PR has a meaningful title or PR has the no-changelog label attached
• Feature or bugfix has tests
• Git history is clean
• If PR impacts documentation, docs team has been notified or an issue has been opened on the documentation repo
• If this PR includes a log pipeline, please add a description describing the remappers and processors.

Additional Notes

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[dd-dominic]

@BartoszBlizniak Doesn't look like you're working off the latest master branch (https://github.com/DataDog/integrations-extras/tree/master/cloudsmith). Please pull the latest changes.