Feature: Group stacks by its agent

[ESPGranEdu]

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Description

I think that it would be nice when you have quite a few stacks defined across multiple agents (including the current), to have them grouped by it's agent.

In case that there aren't more agents configured, the UI will reamin exactly the same

Type of change

Please delete any options that are not relevant.

• User interface (UI)
• New feature (non-breaking change which adds functionality)

Checklist

• My code follows the style guidelines of this project
• I ran ESLint and other linters for modified files
• I have performed a self-review of my own code and tested it
• I have commented my code, particularly in hard-to-understand areas
  (including JSDoc for methods)
• My changes generate no new warnings
• My code needed automated testing. I have added them (this is optional task)

Screenshots (if any)

[up2-date]

I would also like to see a feature like this for Dockge, tags would also be very nice to be able to filter by

[webbk18]

I have 103 containers across 87 stacks and those are spread across 8 hosts. This feature would be a great thing to have access to.

[miltuss]

I also look forward to this functionality

[BriseBolt]

@louislam Why is this feature still not available in Dockge?

[jonnyAnd]

+1 to this please - Agents has been a game changer, but its quite hard to see what is where currently with only the tiny grey subtitle on entries.
@louislam Thank you so much for all your efforts on all your tools!