This pull request resolves#1926 and prevents issues like it from happening in the future
## Rationale for this PR
This PR changes the TypeScript execution package for use in scripts like `build:registry` from `ts-node` to `tsx`. This is because `ts-node` has many difficult quirks to work through (and is slow). In addition, it also has a difficult to understand error for newcomers that *is* reproducible.
### The ts-node error
As shown in #1926, using `ts-node` (specifically in `build:registry`) results in this error: `Unknown file extension ".ts" for /ui/apps/www/scripts/build-registry.ts`. There are many issues in the `ts-node` repository documenting this problem:
* TypeStrong/ts-node/issues/1062
* TypeStrong/ts-node/issues/2033
* TypeStrong/ts-node/issues/1997
Switching the typescript-in-node system to `tsx`, which uses esbuild under the hood, resolves this error.
This PR shouldn't affect tests, representation, etc. and is merely a change of build tools. There is no urgent need to merge this.
I accidentally deleted the head repository on #1937. That will not happen again.
