Emit external component styles sourcemap when optimization is enabled

[alan-agius4]

Command

build

Description

Currently, when optimization is enabled, components sourcemaps are always disabled.

Describe the solution you'd like

This is a request to add support for CSS sourcemaps for components when optimization is enabled which can be done by instead of inline sourcemaps as base64 in the JS file we emit the sourcemap as an external file.

This does come with the drawback that a lot of .map files will be emitted. (1 per component stylesheet)

More context: #22834

[angular-robot]

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[angular-robot]

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[angular-robot]

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