Add and standardize paranext-core scripts

[myieye]

My paranext-core repo was way out of date, so npm install in the extension repo messed with the package lock file.

It felt awkward to have to switch directories in order to update the paranext-core repo, so good ol' AI added some useful scripts for me/us.

It made sense to prefix them all with core:, which made start:core an exception, so I flipped it.

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This change is 

Summary by CodeRabbit

• Chores
  • Updated and reorganized development scripts for improved management of build processes and core dependency operations.

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[imnasnainaec]

What about "core:stop": "cd ../paranext-core && npm run stop",?

(I removed it from #8... where it was out-of-scope anyway.)

Also, core:start and core:stop could use npm --prefix to match core:install.

[imnasnainaec]

@imnasnainaec reviewed 1 file and all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on myieye).