feat(concerto-util): add MonetaryUtil support

[rockaxorb13]

Description

This PR adds a new MonetaryUtil class to the @accordproject/concerto-util package. This utility provides functionality to convert numbers into their written word representation (e.g., converting 100 to "one hundred"), utilizing the n2words library.

Motivation

As discussed in the previous meeting, there is a need for monetary text conversion support within the library to facilitate the upcoming implementation of the Monetary type in the core model. This utility lays the groundwork for that feature.

Changes

• New File: Added lib/monetary.js containing the MonetaryUtil class.
• Dependencies: Added n2words to package.json.
• Exports: Exposed MonetaryUtil via index.js for external consumption.

Verification

• Validated that the new utility correctly converts numbers to text strings using the default locale ('en').
• Confirmed the package installs and exports the new class correctly.

Next Steps

Once merged, this utility will be used by the concerto-core logic to handle monetary serialization and human-readable formatting.

[dselman]

Please use a pinned/exact package version to prevent supply chain attacks.

[dselman]

LGTM - just one small change required for the dependency on n2words. Can you also check that this webpacks ok and the increase in the bundle size?

[rockaxorb13]

Fixed! I've pinned the n2words dependency to version 3.0.0.

I also ran the build locally to verify the bundle size:
Build Status: ✅ Webpack compiled successfully.
Bundle Size: 140 KiB (minimized).

Ready for review!

[dselman]

Please address the build failures.

[rockaxorb13]

@dselman Done! Ready for review

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