chore: Improve playground and watch scripts

[logaretm]

What

The watch script broke down a while ago, changes are not reflected in all output bundles and is generating unwanted files during the watch process in the dist which can be published by mistake.

The scripting files also weren't typed.

How

This fixes the issues noticed there:

• By orchestrating the tsconfig into 2 files, one for scripts/tests and any node related scripting, another for the lib with no access to the Node runtime API.
• Re-writing the watch script to produce all 3 types of modules.
• Removing formwerk from optimized deps to ensure the watcher output is being used.

[changeset-bot]

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Latest commit: b24384f

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