Add TransparentUpgradeableProxy Solidity contract

[Copilot]

Adds the ERC1967-based TransparentUpgradeableProxy contract as specified in the issue. The source contained HTML-encoded entities (>, >=) from the polygonscan submission that needed decoding to valid Solidity operators.

• HTML entity fixes: > → > and >= → >= across all comparison expressions (6 occurrences in Address, ERC1967Upgrade)
• Comment typo fixes (flagged in review): internall → internal, overriden → overridden, initializating → initializing

// Before (HTML-encoded from polygonscan)
return size > 0;
require(address(this).balance >= amount, "Address: insufficient balance");

// After
return size > 0;
require(address(this).balance >= amount, "Address: insufficient balance");

Contract includes: StorageSlot library, Address library, IBeacon interface, ERC1967Upgrade, Proxy, ERC1967Proxy, and TransparentUpgradeableProxy.

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