perf: micro optimizations

[boopathi]

A few performance improvements to compilation based on micro-optimizations / benchmarks -

1. string concatenation body += seems to be faster than [].join("\n") that is used by generate-function.
2. Prefer looping over recursion as tail calls are not optimized in v8 as of this writing
3. Add memoization to simple functions - e.g. joinOriginPaths
4. Restructure compilations of skip/include to a string[][] and avoid the unnecessary string manipulation. Reduces complexity - simplifies filtering of unwanted trues and code generation.

Next set of optimizations will follow in separate PRs.

Observations with this -

For a very big query (1100 lines formatted, 30+ fragments, 40+ variables, max depth - 8) that takes 1.7s to compile, this PR brings it down to around 1.4s - around 17% faster.

[boopathi]

👍