e648a0c4ca
`NgCompiler` is the heart of ngtsc and can be used to analyze and compile Angular programs in a variety of environments. Most of these integrations rely on `NgProgram` and the creation of an `NgCompilerHost` in order to create a `ts.Program` with the right shape for `NgCompiler`. However, certain environments (such as the Angular Language Service) have their own mechanisms for creating `ts.Program`s that don't make use of a `ts.CompilerHost`. In such environments, an `NgCompilerHost` does not make sense. This commit breaks the dependency of `NgCompiler` on `NgCompilerHost` and extracts the specific interface of the host on which `NgCompiler` depends into a new interface, `NgCompilerAdapter`. This interface includes methods from `ts.CompilerHost`, the `ExtendedTsCompilerHost`, as well as APIs from `NgCompilerHost`. A consumer such as the language service can implement this API without needing to jump through hoops to create an `NgCompilerHost` implementation that somehow wraps its specific environment. PR Close #37118
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