Remove type coupling between core and extract

[bigtimebuddy]

Bug

This type issue happens when using @pixi/core without installing @pixi/extract.

node_modules/@pixi/core/index.d.ts:13:43 - error TS7016: Could not find a declaration file for module '@pixi/extract'. '/node_modules/@pixi/extract/lib/extract.js' implicitly has an 'any' type.
  Try `npm install @types/pixi__extract` if it exists or add a new declaration (.d.ts) file containing `declare module '@pixi/extract';`

13 import type { Extract as Extract_2 } from '@pixi/extract';

Description

CanvasExtract was removed in #6503 as a property of CanvasRenderer. This make this change consistent with Renderer and Extract. The extract property is redundant with plugins.extract and unnecessary. It also create an undesirable dependency between core with extract.

[codecov-io]

Codecov Report

Merging #7120 (b3c885a) into main (13b7c21) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##              main     #7120   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           17        17           
  Lines          699       699           
=========================================
  Hits           699       699           

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