Move registerCoreWithSerializer to its own file

[thebriando]

↪️ Pull Request

This moves the registerCoreWithSerializer function to a different module to prevent circular dependency problems

💻 Examples

🚨 Test instructions

✔️ PR Todo

• Added/updated unit tests for this change
• Filled out test instructions (In case there aren't any unit tests)
• Included links to related issues/PRs

[devongovett]

Was this function somehow getting called multiple times now? Looks like this wasn't there before

[thebriando]

Ah we had a different check for this before https://github.com/parcel-bundler/parcel/pull/9396/files#diff-9575fdb466517de49a2fcba34666f6aafe312d93c8c66978f8d7e6b27464b792L51-L55

and I thought I needed to change it bc the function is called in Parcel.js and worker.js and I was running into this error

parcel/packages/core/core/src/serializer.js

Lines 11 to 13 in 0ab3f0f

	if (ctorToName.has(ctor)) {
	throw new Error('Class already registered with serializer');
	}

but the error was happening bc I had an unused import that was calling the function again. I'll change it back

[devongovett]

lgtm