build: add missing src/tracing header files
I noticed that only one header from src/tracing is included in the sources list in node.gyp. Not sure if this is intentional or not so I wanted to bring it up just in case this was overlooked.
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
commit message follows commit guidelines
Affected core subsystem(s)
build