Add extension API to QJSEngine

This allows users in a JavaScript-only environment to install extensions including:

- Translation functions (qsTr(), etc.)
- The console object (console.log(), print(), etc.)
- Garbage collection functions (gc())

This deprecates installTranslatorFunctions(). This API results in less
clutter in the API, as we'd otherwise need to have several functions
for each type of extension.

[ChangeLog][QJSEngine] Introduced an extension API that allows
installing various function and object extensions (qsTr(),
console.log(), etc.) to QJSEngine.
[ChangeLog][QJSEngine] installTranslatorFunctions() was deprecated in
favor of the new extension API (see installExtensions()).

Change-Id: I4d6eb2097c3eda6810e967b2e8f6441c28c91a16
Task-number: QTBUG-40772
Reviewed-by: Simon Hausmann <simon.hausmann@theqtcompany.com>

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