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)

server/scripts/reset-password.ts

@@ -0,0 +1,58 @@
+import { program } from 'commander'
+import readline from 'readline'
+import { Writable } from 'stream'
+import { isUserPasswordValid } from '@server/helpers/custom-validators/users.js'
+import { initDatabaseModels } from '@server/initializers/database.js'
+import { UserModel } from '@server/models/user/user.js'
+
+program
+  .option('-u, --user [user]', 'User')
+  .parse(process.argv)
+
+const options = program.opts()
+
+if (options.user === undefined) {
+  console.error('All parameters are mandatory.')
+  process.exit(-1)
+}
+
+initDatabaseModels(true)
+  .then(() => {
+    return UserModel.loadByUsername(options.user)
+  })
+  .then(user => {
+    if (!user) {
+      console.error('Unknown user.')
+      process.exit(-1)
+    }
+
+    const mutableStdout = new Writable({
+      write: function (_chunk, _encoding, callback) {
+        callback()
+      }
+    })
+    const rl = readline.createInterface({
+      input: process.stdin,
+      output: mutableStdout,
+      terminal: true
+    })
+
+    console.log('New password?')
+    rl.on('line', function (password) {
+      if (!isUserPasswordValid(password)) {
+        console.error('New password is invalid.')
+        process.exit(-1)
+      }
+
+      user.password = password
+
+      user.save()
+        .then(() => console.log('User password updated.'))
+        .catch(err => console.error(err))
+        .finally(() => process.exit(0))
+    })
+  })
+  .catch(err => {
+    console.error(err)
+    process.exit(-1)
+  })