revamp of npm scripts

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Rather than hard-coding various npm scripts in the actual package.json, farm them out to a lib and some simple sub-commands scripts.

[updated] To use it, do one of

• npm run klotho build: Does all the npm, klotho, and pulumi build steps (including npm install if needed, and in the compiled dir)
• npm run pulumi ...: forwards to pulumi, with the appropriate stack name and cwd
  • this also exports PULUMI_CONFIG_PASSPHRASE='' if you don't have either PULUMI_CONFIG_PASSPHRASE or PULUMI_CONFIG_PASSPHRASE_FILE set; Klotho's default generated stack requires an empty password

Note that this sets up a non-standard directory structure for klotho output, but only if you use an app name other than the default (by setting an env var). Instead of compiled, it's compiled-klotho/$app_name. This is specifically to keep prod and dev compilations/deployments separate, which is an important use case for me. But I'm flexible on it, and especially on the specific dir structure.

Updated documentation: CloudCompilers/docs#93

[ghost]

Updated to have:

• npm run klotho does all the building
  • npm install, npm build, npm test, and also the npm install --prefix compiled
• npm run pulumi <...> runs pulumi with the right dir and stack name