Added pprof into the node API to debug memory leaks

[sparshev]

Integrated pprof to get profiling of the running Fish node - really helpful to understand what's inside causing bugs.

Tried to implement through pperf.Index(), but it's processing only handlers without the advanced calls like trace & profile... So implementation is a bit bigger then could be...

Related Issue

64

Motivation and Context

In order to debug OOM's

How Has This Been Tested?

Manually

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] I have signed the Adobe Open Source CLA.
• [x] My code follows the code style of this project.
• [x] My change requires a change to the documentation.
• [x] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [x] All new and existing tests passed.