move away from reflect-metadata

[cayter]

Is there an existing issue that is already proposing this?

• I have searched the existing issues

Is your feature request related to a problem? Please describe it

As mentioned in the above, tc39 has finalised the decorator metadata spec which leads to reflect-metadata implementation being outdated.

esbuild has recently released decorator metadata support that follows tc39 stage 3 spec which makes it super easy for us to run nestjs app via node --import=tsx app.ts (assuming tsx is gonna upgrade its esbuild dependency to v0.21.3 soon).

Describe the solution you'd like

N/A

Teachability, documentation, adoption, migration strategy

N/A

What is the motivation / use case for changing the behavior?

• Much simpler setup.
• Better parity between dev/prd.

[micalevisk]

Duplicated #11414