Added basics/account-data/poseidon

[ritikbhatt20]

Key Differences from previous account-data PRs:

- Addition of the latest Poseidon library code, which includes a payer argument for init and initIfNeeded, ensuring compatibility with multi-signer configurations
- previous PR’s had been defaulted to a single signer with only .init() function which will not work with new poseidon code now.
- Follows the original program structure from the account-data example in Anchor, ensuring consistency.
- Includes both Anchor and Bankrun tests, providing comprehensive test coverage that was missing in previous PRs.
- In some PR's the program structure was not followed and in some bankrun tests weren't there.

• replaced all occurrences of yarn with pnpm to maintain consistency across the project.
• executed pnpm fix to ensure code quality.
• committed the pnpm-lock.yaml file to the repository.

[ritikbhatt20]

gm @heyAyushh ,

I've completed the requested steps:

1. Merged main into my branch.
2. Ran pnpm fix.
3. Verified the implementation includes the transpiled Anchor program and TypeScript files.
4. Synchronized program ID
5. Ran cargo fmt and cargo clippy for Rust code quality.
6. Pushed all updates.

Please review again. Thank you!