feat: add Monad network support

[therealharpaljadeja]

What

Add Monad network support to OWS core and OWS pay

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Note

Medium Risk
Adds a new EVM network across core chain parsing and default RPC configuration; low blast radius but touches shared chain registry/config defaults. Also adds payment-layer tests referencing caip2_reference, which may fail to compile if that helper isn’t defined/exported.

Overview
Adds Monad as a first-class supported EVM network (eip155:143) by extending the known chain registry and updating docs to list the new canonical CAIP-2 ID and shorthand alias.

Extends default configuration to include a built-in RPC endpoint for Monad (https://rpc.monad.xyz) and updates unit tests in ows-core and ows-pay to validate name/CAIP-2 parsing and display behavior for the new network.

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Cursor Bugbot has reviewed your changes and found 1 potential issue.

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[njdawn]

lgtm, after ci is fixed

[therealharpaljadeja]

@njdawn issue raised by Cursor Bugbot has been resolved