fix: missing node constants export

[thantos]

Debugging typescript performance issues in another project.

Typescript started to pull in ../eventual/* files from across my file system. This seems to be because ./constants/index.js (@eventual/core/contstants) did not actually exist in @eventual/core because it wasn't included in the node files.

My system seems to resolve it to my local, but I am unsure what it is doing on other systems. When the file is included from local, typescript started to pull other core files from my local eventual repo too (see below).

• Added constants to files in package.json to match the internal path.

(via tsc --explainFiles)

../eventual/packages/@eventual/core/lib/cjs/http/command-rpc-path.d.ts
  Imported via "./http/command-rpc-path.js" from file '../eventual/packages/@eventual/core/lib/cjs/constants.d.ts'
../eventual/packages/@eventual/core/lib/cjs/constants.d.ts
  Imported via "../lib/cjs/constants.js" from file '../eventual/packages/@eventual/core/constants/index.d.ts'
../eventual/packages/@eventual/core/constants/index.d.ts
  Imported via "@eventual/core/constants" from file 'node_modules/.pnpm/@eventual+client@0.50.4/node_modules/@eventual/client/lib/cjs/base-http-client.d.ts' with packageId '@eventual/core/constants/index.d.ts@0.50.3'