Prefer npm cmake/ninja instances instead of system instances

[devappd]

Currently, this package is hardcoded to prefer system installs of cmake/ninja instead of those installed into node_modules.

Consider defaulting to the node_modules installation, and allow configurable path to a system installation. E.g., cmake-path="/path/to/cmake" or cmake-system-path="true" to search PATH first before looking at cmake-path then node_modules in that order.

Re: downloading:

1. On NPM install time, don't download anything nor print anything on NPM
2. On NPM build script, if CMake/Ninja doesn't exist on PATH or NPMRC, then download it to module.

[devappd]

Currently, cmake-binaries always downloads CMake even if it already exists on system PATH. Resolved with devappd/cmake-binaries@639b977

[devappd]

This may depend on a couple long-term goals which are to make CMake and Ninja run on WASM.

The current behavior (prefer system installs instead of NPM installs) is fine, albeit not ideal. The issue with supporting NPM-first priority is that CMake takes a while to download on NPM.