Switch to esbuild for Inferno project

[jhsware]

The current build pipeline for the Inferno project is slow enough to be an obstacle in development and testing of the core libraries. Esbuild promises to be an order of magnitude faster with support for both JSX and TS.
https://github.com/evanw/esbuild

Perhaps one could reach out to Evan Wallace and the Esbuild team to discuss if it is feasible and what obstacles might be in the way.

[jhsware]

This is a missing feature in Esbuild that is required for production builds of Inferno evanw/esbuild#128

[jhsware]

We ended it up with this instead #1558

[Havunen]

I think the current build is fast enough for daily development work. We can close this issue