improve build / ci system

[YousefED]

• migrate away from lerna to a more modern solution
• make the publishing process easier

investigate:

• turbo
• https://www.npmjs.com/package/@changesets/cli
• biome
• rushx
• https://github.com/googleapis/release-please
• pnpm?

[nperez0111]

We will need to also look into:

• CI pipelines for publishing packages
• Workflows for automating publishing steps (attestation?)
• Build scripts to make sure we are bundling what we should be (i.e. don't bundle react in @blocknote/react`

[YousefED]

done with move to nx