refactor(compiler): replace Comment nodes with leadingComments property (#38811)

Common AST formats such as TS and Babel do not use a separate
node for comments, but instead attach comments to other AST nodes.
Previously this was worked around in TS by creating a `NotEmittedStatement`
AST node to attach the comment to. But Babel does not have this facility,
so it will not be a viable approach for the linker.

This commit refactors the output AST, to remove the `CommentStmt` and
`JSDocCommentStmt` nodes. Instead statements have a collection of
`leadingComments` that are rendered/attached to the final AST nodes
when being translated or printed.

PR Close #38811

packages/compiler-cli/BUILD.bazel

@@ -32,6 +32,7 @@ ts_library(
         "//packages/compiler-cli/src/ngtsc/perf",
         "//packages/compiler-cli/src/ngtsc/reflection",
         "//packages/compiler-cli/src/ngtsc/shims",
+        "//packages/compiler-cli/src/ngtsc/translator",
         "//packages/compiler-cli/src/ngtsc/typecheck",
         "@npm//@bazel/typescript",
         "@npm//@types/node",