Work towards #3692

Description

Add some benchmarks that we can use to evaluate the performance of the current interpreter and new execution environments:

• fib_dynamic: Fibonacci function, using dynamic programming
• fib_iterative: Fibonacci function, iterative
• fib_recursive: Fibonacci function, recursive
• binarytrees: https://benchmarksgame-team.pages.debian.net/benchmarksgame/description/binarytrees.html#binarytrees
• fannkuch: https://benchmarksgame-team.pages.debian.net/benchmarksgame/description/fannkuchredux.html#fannkuchredux

We can use these in the Go benchmarks with go:embed.

• Targeted PR against master branch
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work
• Code follows the standards mentioned here
• Updated relevant documentation
• Re-reviewed Files changed in the Github PR explorer
• Added appropriate labels