Migrate server to ESM

Sorry for the very big commit that may lead to git log issues and merge
conflicts, but it's a major step forward:

 * Server can be faster at startup because imports() are async and we can
   easily lazy import big modules
 * Angular doesn't seem to support ES import (with .js extension), so we
   had to correctly organize peertube into a monorepo:
    * Use yarn workspace feature
    * Use typescript reference projects for dependencies
    * Shared projects have been moved into "packages", each one is now a
      node module (with a dedicated package.json/tsconfig.json)
    * server/tools have been moved into apps/ and is now a dedicated app
      bundled and published on NPM so users don't have to build peertube
      cli tools manually
    * server/tests have been moved into packages/ so we don't compile
      them every time we want to run the server
 * Use isolatedModule option:
   * Had to move from const enum to const
     (https://www.typescriptlang.org/docs/handbook/enums.html#objects-vs-enums)
   * Had to explictely specify "type" imports when used in decorators
 * Prefer tsx (that uses esbuild under the hood) instead of ts-node to
   load typescript files (tests with mocha or scripts):
     * To reduce test complexity as esbuild doesn't support decorator
       metadata, we only test server files that do not import server
       models
     * We still build tests files into js files for a faster CI
 * Remove unmaintained peertube CLI import script
 * Removed some barrels to speed up execution (less imports)

2 files changed, 28 insertions, 0 deletions

diff --git a/packages/server-commands/src/cli/cli-command.ts b/packages/server-commands/src/cli/cli-command.ts
new file mode 100644
index 000000000..8b9400c85
--- /dev/null
+++ b/packages/server-commands/src/cli/cli-command.ts
@@ -0,0 +1,27 @@
+import { exec } from 'child_process'
+import { AbstractCommand } from '../shared/index.js'
+
+export class CLICommand extends AbstractCommand {
+
+  static exec (command: string) {
+    return new Promise<string>((res, rej) => {
+      exec(command, (err, stdout, _stderr) => {
+        if (err) return rej(err)
+
+        return res(stdout)
+      })
+    })
+  }
+
+  getEnv () {
+    return `NODE_ENV=test NODE_APP_INSTANCE=${this.server.internalServerNumber}`
+  }
+
+  async execWithEnv (command: string, configOverride?: any) {
+    const prefix = configOverride
+      ? `NODE_CONFIG='${JSON.stringify(configOverride)}'`
+      : ''
+
+    return CLICommand.exec(`${prefix} ${this.getEnv()} ${command}`)
+  }
+}
diff --git a/packages/server-commands/src/cli/index.ts b/packages/server-commands/src/cli/index.ts
new file mode 100644
index 000000000..d79b13a76
--- /dev/null
+++ b/packages/server-commands/src/cli/index.ts
@@ -0,0 +1 @@
+export * from './cli-command.js'