Add compatiblity with transpilers.

[gabrielgortabns]

Let say, I have transpiler, that transform some code in ./src/ directory to other code in ./build/ directory. It would be nice, to be able to trigger upload from ./src/ directory, that would upload transpiled version of code.

Possible solution:

Configuration/setting where user can specify that if they trigger upload in ./src/FileCabined/SuiteScripts/sample.ts it will upload ./build/FileCabined/SuiteScripts/sample.js... it could be defined via regex, or syntax like:

{
    "source": ["src/**/*.ts", "src/**/*.js"]
    "build": ["build/**/*.js"]
}

or function:

export function pathUpdate(path) {
    return path.replace(/^build/, "src").replace(/.ts$/, ".js");
}