feat: On-Chain Airdrop checker [WIP]

[notJoon]

Description

Implements a basic airdrop checker functionality. The implementation follows a "Reader-only realm" pattern and provides simple APIs for checking token balances and total supply.

WIP

Key Changes

• Add TotalSupply() method to get total supply of a specific denomination
• Add AddressBalance() method to get balance of an address for a specific denomination

[Gno2D2]

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Codecov Report

Attention: Patch coverage is 80.00000% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
gno.land/pkg/sdk/vm/builtins.go	80.00%	1 Missing and 1 partial ⚠️

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