Isolate and namespace `StimulusReflex::Installer`

[marcoroth]

Type of PR

Enhancement

Description

This pull request isolates the methods defined lib/stimulus_reflex/installer.rb into a StimulusReflex::Installer constant so they don't pollute the global namespace if the file is required.

CableReady got a similar PR: https://github.com/stimulusreflex/cable_ready/pull/295

Why should this be added

Exposing all the methods from the installer in the global namespace could lead to issues down the road. Methods like options are likely to be overridden.

Checklist

• [x] My code follows the style guidelines of this project
• [x] Checks (StandardRB & Prettier-Standard) are passing

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