At this moment addition of the new NPM package to Lexical monorepo requires repetitive updates to ~10 different files. On top of that Meta specific WWW build requires separate changes done to internal codebase in order to keep it running.

Example:
In #5861 we reverted #5830 that added @lexical/devtools-core package. Later it was re-added in #5864 with fixes done to the build system.

Scope:

• Document steps necessary to add new NPM package to Lexical monorepo. Specifically:
  • PR description format to highlight new package addition
  • Changes to the shared files necessary
  • Merge procedure
• Reduce number of changes needed to add new package