Add ng xi18n support for source code strings

[jaska45]

🚀 Feature request

ng xi18n should also extract strings from the source code files.

Command (mark with an x)

• new
• build
• serve
• test
• e2e
• generate
• add
• update
• lint
• xi18n
• run
• config
• help
• version
• doc

Description

Currently xi18n extracts strings only from templates, not from .ts file. Starting from Angular 9 you can now localize source code string using $localize. However without the extraction support this feature is pretty useless.

Describe the solution you'd like

When I run ng xi18n, it should extract strings from templates and .ts files.

[alan-agius4]

//cc @petebacondarwin

[elvisbegovic]

Maybe duplication of feat req angular/angular#11405 and discussion about it/answer is here too angular/angular#16477 (comment)

[alan-agius4]

Thanks @elvisbegovic you are correct.

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