Add syntax highlighting for typedef #1
Description
The typedef is one declaration in p4 16 spec: https://p4.org/p4-spec/docs/P4-16-v1.2.2.html#sec-typedef
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The typedef is one declaration in p4 16 spec: https://p4.org/p4-spec/docs/P4-16-v1.2.2.html#sec-typedef