Fix/koios fetchutxos datums 612

[ruhil6789]

Summary

This PR fixes a bug in the Koios provider's fetchUTxOs method where inline datums were not being fetched from the API, causing the OfflineEvaluator to fail when resolving UTxOs with inline datums.

Problem:

• The fetchUTxOs method was missing the _datums: true parameter in the API request to the Koios tx_info endpoint
• This meant that inline datums were not included in the API response, even though they exist in the transaction
• When using OfflineEvaluator with the Koios provider, transactions spending UTxOs with inline datums would fail with "missing required datum" errors
• The toUTxO method already correctly mapped inline_datum?.bytes to plutusData, but the data was never fetched from the API

Solution:

• Added _datums: true parameter to the tx_info API request in the fetchUTxOs method
• This ensures that inline datums are included in the API response and properly mapped to plutusData in the UTxO output
• The fix is minimal and non-breaking - it only adds the missing parameter that should have been there from the start

Affect components

• @meshsdk/provider

Type of Change

• Bug fix (non-breaking change which fixes an issue)

Related Issues

• Closes Incorrect datum for fetchUtxos() with Koios provider #612

Checklist

• My code is appropriately commented and includes relevant documentation, if necessary
• I have added tests to cover my changes, if necessary
• I have updated the documentation, if necessary
• All new and existing tests pass (i.e. npm run test)
• The build is pass (i.e. npm run build)

Additional Information

Changes Made:

File: packages/mesh-provider/src/koios.ts

• Line 440: Added _datums: true parameter to the tx_info POST request in the fetchUTxOs method

**Before:**ypescript
const { data, status } = await this._axiosInstance.post("tx_info", {
_tx_hashes: [hash],
_assets: true,
_scripts: true,
_bytecode: true,
});