Instrument remainder of file operations within os sink

[tomaisthorpe]

Currently the os sink only instruments OpenFile, which is used in a lot of the higher level methods, however, there are methods that directly call the syscalls, so adding them to the instrumentation.

Summary by Aikido

Security Issues: 0	🔍 Quality Issues: 1	Resolved Issues: 0

⚡ Enhancements

• Instrumented additional os file operations to perform security checks.

🔧 Refactors

• Renamed Examine to ExamineOp and generalized scan to accept op.

^{More info}