Test setup for prebuild files

[cloverich]

• Add a test setup for prebuild; support using SQLite in tests; explore node native testing lib vs mocha
• Add tests for documents search, save, etc (and tags)
• Integrate it into the testing pipeline

Current test setup is very naive -- it just compiles the full test+dependencies into test files with esbuild, then runs them:

const testFiles = findTestFiles("src");

testFiles.forEach(async (file) => {
  await esbuild.build({
    entryPoints: [file],
    // NOTE: If changing filename, also update findTestFiles glob above to avoid
    // bundled test files being used as source!
    outfile: file.replace(".test.ts", ".test.bundle.js"),
    bundle: true,
    platform: "node",
    external: ["mocha"],
    plugins: [],
  });
});

It is surprisingly fast though -- as esbuild tends to be. I need to extend this setup for prebuild which works in node-land. Should support talking to sqlite so the tests can be real, and specifically test the documents module which creates / finds / saves notes, the core API of the app.