[fingerprint] introduce fingerprint.config.js support

[Kudo]

Why

follow up feedback from #28712 that we should add fingerprint config support.

How

introduce fingerprint.config.js support to override Options. not all options are supported, because ignorePaths we would like to use .fingerprintignore and platform is not supported for sure.
the priority is explicit Options > fingerprint.config.js > default Options.

Test Plan

1. add unit tests
2. having this fingerprint.config.js in a project and see whether the result fingerprint hash would be sha256

/** @type {import('@expo/fingerprint').Config} */
const config = {
  hashAlgorithm: 'sha256',
};

module.exports = config;

Checklist

• Documentation is up to date to reflect these changes (eg: https://docs.expo.dev and README.md).
• Conforms with the Documentation Writing Style Guide
• This diff will work correctly for npx expo prebuild & EAS Build (eg: updated a module plugin).

[wschurman]

Awesome!

[wschurman]

Is the value for this key serializable to JSON? (can it be specified)

[Kudo]

mostly, the config is just configurable Options. probably Buffer is not serializable but can use string instead.

would make the implementation simpler first without validator or parser. let's add it later if necessary.