Alex Rickabaugh c55bf4a4a3 refactor(compiler-cli): identify structural directives (#40032)
This commit introduces an `isStructural` flag on directive metadata, which
is `true` if the directive injects `TemplateRef` (and thus is at least
theoretically usable as a structural directive). The flag is not used for
anything currently, but will be utilized by the Language Service to offer
better autocompletion results for structural directives.

PR Close #40032
2020-12-14 12:08:41 -08:00
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