dillon1000/react

Add script to generate inline Fizz runtime (#25481)

* Move Fizz inline instructions to unified module

Instead of a separate module per instruction, this exports all of them
from a unified module.

In the next step, I'll add a script to generate this new module.

* Add script to generate inline Fizz runtime

This adds a script to generate the inline Fizz runtime. Previously, the
runtime source was in an inline comment, and a compiled version of the
instructions were hardcoded as strings into the Fizz implementation,
where they are injected into the HTML stream.

I've moved the source for the instructions to a regular JavaScript
module. A script compiles the instructions with Closure, then generates
another module that exports the compiled instructions as strings.

Then the Fizz runtime imports the instructions from the
generated module.

To build the instructions, run:
  yarn generate-inline-fizz-runtime

In the next step, I'll add a CI check to verify that the generated files
are up to date.

* Check in CI if generated Fizz runtime is in sync

The generated Fizz runtime is checked into source. In CI, we'll ensure
it stays in sync by running the script and confirming nothing changed.