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feat(compiler): ability to mark an InvokeFunctionExpr as pure (#26860)
Uglify and other tree-shakers attempt to determine if the invocation of a function is side-effectful, and remove it if so (and the result is unused). A /*@__PURE__*/ annotation on the call site can be used to hint to the optimizer that the invocation has no side effects and is safe to tree-shake away. This commit adds a 'pure' flag to the output AST function call node, which can be used to signal to downstream emitters that a pure annotation should be added. It also modifies ngtsc's emitter to emit an Uglify pure annotation when this flag is set. Testing strategy: this will be tested via its consumers, by asserting that pure functions are translated with the correct comment. PR Close #26860
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