[5.1] Convert mod_banners to service provider

[heelc29]

Summary of Changes

Converts the banners site module to service provider

Testing Instructions

• create site module Banners
• check site output

Note: system test exists
https://github.com/joomla/joomla-cms/blob/5.1-dev/tests/System/integration/site/modules/mod_banners/Default.cy.js

Actual result BEFORE applying this Pull Request

module works

Expected result AFTER applying this Pull Request

module works

Link to documentations

Please select:

• No documentation changes for docs.joomla.org needed
• No documentation changes for manual.joomla.org needed

[ceford]

I have tested this item ✅ successfully on 57e0557

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/42214.}

[viocassel]

I have tested this item ✅ successfully on 0c3ff13

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/42214.}

[LadySolveig]

Thank you @heelc29 and for testing and review @ceford @viocassel @sandewt