feat: utxo-rpc provider fetchAddressAssets

[nelsonksh]

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Summary

Please provide a brief, concise summary of the changes in your pull request. Explain the problem you are trying to solve and the solution you have implemented.

utxo-rpc provider: fetchAddressAssets method implementation + playground fix: comment unimplemented methods

Affect components

Please indicate which part of the Mesh Repo

• @meshsdk/common
• @meshsdk/contract
• @meshsdk/core
• @meshsdk/core-csl
• @meshsdk/core-cst
• @meshsdk/provider
• @meshsdk/react
• @meshsdk/transaction
• @meshsdk/wallet
• Mesh playground (i.e. https://meshjs.dev/)
• Mesh CLI

Type of Change

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• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Bug fix (non-breaking change which fixes an issue)
• Code refactoring (improving code quality without changing its behavior)
• Documentation update (adding or updating documentation related to the project)

Related Issues

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• Issue - #329

nil

Checklist

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• 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

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