src, lib: use internal/options for indicating breakFirstLine
Before: _breakFirstLine was set onto process object.
After: This is now indicated by --inspect-brk option, which can be obtained from internal/options.
This commit resolves the following TODO - https://github.com/nodejs/node/blob/master/src/inspector_agent.cc#L715-L718
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
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