C++ benchmarks

[mcopik]

Document the ongoing progress of implementing C++ benchmarks.

• C++ benchmarks on AWS Lambda.
• Configurable dependencies - CMake adjust.

[AtulRajput01]

I'm currently working on this issue and provide updates on your progress as you go along, please assign it to me.

[mcopik]

The PR #99 has been rebased on master, and we need few additional fixes:

• Storage API should be adjusted to provide both the standard API and the operations needed for I/O benchmarks
• Key-value storage API should be adjusted to match current NoSQL offerings.