fix(indexer-native): abandon neon-utils in favor of napi-6

[Theodus]

I was previously unable to modify indexer-native without the native module failing to self-register. Switching to napi-6 seems to resolve this issue.

[Theodus]

Looks like we need to release the new version to use it on the other packages

[tilacog]

Rebased on top of latest main

[dwerner]

Stole this for #975, thanks!