Add numeric currency code by ISO 4217 standard

[letehaha]

Clear and concise description of the problem

Right now finance.currency has a structure of { code: 'USD', name: 'US Dollar', symbol: '$' }, but in many financial application I usually see numeric currency code usage, instead of string (so 840 instead of USD).

Suggested solution

The suggestion is to add numericCode (probably needs a better name) to the currency object inside faker.finance.

I can try to implement that by myself

Alternative

No response

Additional context

No response

[github-actions]

Thank you for your feature proposal.

We marked it as "waiting for user interest" for now to gather some feedback from our community:

• If you would like to see this feature be implemented, please react to the description with an up-vote (:+1:).
• If you have a suggestion or want to point out some special cases that need to be considered, please leave a comment, so we are aware about them.

We would also like to hear about other community members' use cases for the feature to give us a better understanding of their potential implicit or explicit requirements.

We will start the implementation based on:

• the number of votes (:+1:) and comments
• the relevance for the ecosystem
• availability of alternatives and workarounds
• and the complexity of the requested feature

We do this because:

• There are plenty of languages/countries out there and we would like to ensure that every method can cover all or almost all of them.
• Every feature we add to faker has "costs" associated to it:
  • initial costs: design, implementation, reviews, documentation
  • running costs: awareness of the feature itself, more complex module structure, increased bundle size, more work during refactors

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