Add ability to set keepNames for esbuild

[foxel]

Command

build, serve

Description

esbuild optimizes TS code with decorators a bit different to tsc. This is not a huge difference but class names are lost if a class is decorated. There is keepNames (keep-names) option in esbuild that ensures the name is restored. It would be great if angular cli expose this opton in angular.json

Describe the solution you'd like

keepNames can be exposed in angular.json under AngularDevkitBuildAngularBuildersBrowserEsbuildSchema

getEsBuildCommonOptions in this case should just forward this option to BuildOptions

Describe alternatives you've considered

Currently, I've patched getEsBuildCommonOptions to set keepNames as !optimizationOptions.scripts within my project.
Setting the keepNames this way might be an alternative, but explicit exposure is best IMHO

[alan-agius4]

Duplicate of #15761 and #14487

[foxel]

@alan-agius4 how is this a duplicate? I don't see common points

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