configurable package.json path for node releases

Thanks for stopping by to let us know something could be better!

**Is your feature request related to a problem? Please describe.**
We have a pretty unique monorepo in which we release only one module and all other modules are rolled up to it during the build phase. When we release, we update `./packages/module_1/package.json`. However, release-please modifies the `./package.json` file, which causes a difficulty when we generate a release.

**Describe the solution you'd like**
We should be able to use `--version-file` with `node` release strategy so that we can override `package.json` path.

**Describe alternatives you've considered**
We have tried to use different strategies instead of node but nothing seems to work.

**Additional context**
I will be happy to contribute and submit a solution for this.