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)

1 files changed, 5 insertions, 4 deletions

diff --git a/scripts/build/server.sh b/scripts/build/server.sh
index a2dfc3dd9..bbab633a2 100755
--- a/scripts/build/server.sh
+++ b/scripts/build/server.sh
@@ -2,10 +2,11 @@
 
 set -eu
 
-rm -rf ./dist
+rm -rf ./dist ./packages/*/dist
 
-npm run tsc -- -b --verbose
+npm run tsc --  -b --verbose server/tsconfig.json
 npm run resolve-tspaths:server
 
-cp -r "./server/static" "./server/assets" "./dist/server"
-cp -r "./server/lib/emails" "./dist/server/lib"
+cp -r "./server/server/static" "./server/server/assets" ./dist/server
+cp -r "./server/server/lib/emails" "./dist/server/lib"
+cp "./server/scripts/upgrade.sh" "./dist/scripts"