feat: add BatchMintNFT contract with upgradeable functionality and deployment scripts

[Douglasacost]

• Introduced BatchMintNFT contract for public batch minting of NFTs, utilizing OpenZeppelin's upgradeable contracts.
• Added deployment script for BatchMintNFT and an upgrade script for managing contract upgrades.
• Updated foundry.toml and remappings for new dependencies.
• Included comprehensive tests for minting, upgrading, and security checks.

[aliXsed]

Closing as superseded by #98 (merged).

#98 bundled this PR's entire content, and everything here is now in main:

• BatchMintNFT.sol, both deploy/upgrade scripts, and the full test suite are byte-identical to main — except this branch still carries the unused MINTER_ROLE constant and the no-op burn() override, which were removed as review fixes on Bridge Indexing: Multichain support L1<>L2 sync data #98. Merging this PR would only re-introduce that dead code.
• The subquery/mainnet-complete.ts datasource registration and const.ts entry landed via Bridge Indexing: Multichain support L1<>L2 sync data #98 as well (main's version additionally has the BridgeL2 datasource).
• The .cspell.json / foundry.toml / remappings.txt changes are superseded by newer versions on main.

If role-gated minting was actually intended for BatchMintNFT, that's tracked in NodleCode/meta#213 (item 2) — re-introduce it there with a grant in the initializer and onlyRole enforcement on the mint functions, rather than by reviving this branch.