Move ArrayBuilder.GetInstance helpers to Microsoft.CodeAnalysis.PooledObjects package

[tmat]

These helpers are generally useful to consumers of the package. Especially when combining Roslyn source packages - see #76937

They were defined in Workspace layer since we do not want to allow using them in the compiler (due to perf concerns when used widely). To keep this intentional constraint the change adds them to compiler-specific banned API list.

[tmat]

Adds [NonCopyable] attribute to the type definition.

[sharwell]

What about just requiring the consumer to provide this attribute in all cases?

[tmat]

Isn't the analyzer Roslyn specific? I would rather not impose more requirements on consumers of this source package.

That said, I'm working on another source package (say Microsoft.CodeAnalysis.Contracts) with basic contracts and exception utilities, which are used by our threading utilities (extracted to source package #76937).

We can include NonCopyable there. It's a contract after all, so it would fit.

[tmat]

#76997 (Add Microsoft.CodeAnalysis.Contracts source package)

[ToddGrun]

[jaredpar]

@333fred PTAL