[SDTEST-1129] Extract Knapsack instrumentation as standalone integration #253
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What does this PR do?
Refactors Contrib module and extracts Knapsack instrumentation as a standalone integration (rather than putting knapsack instrumentation inside rspec).
I used this work also as a chance to make instrumentation code more object oriented and untangle the complex mix of class-level and object-level methods that was inherited from Tracing implementation.
Motivation
For the auto-instrumentation feature we need to instrument every gem as a separate integration.
How to test the change?
No changes in the behaviour, covered by existing unit tests.