Add keycard support

[hiletmis]

Closes Add keycard support as alternative to MNEMONIC based signer

This PR adds support for keycard by implementing keycard-hardhat-provider plugin.

• accounts object is changed to optional to allow keycardAccount to override the main signer.
• KEYCARD_ACCOUNT is a wallet address, once it is placed in .env file hardhat config will expect a keycard wallet with specified account. If there is no wallet address keycardAccount will not be configured.

Additional changes:
A transaction confirmation is added to deployApi3ReaderProxyV1 to avoid transaction overlap while deploying contracts.

[bdrhn9]

Thank you for this intellectual approach and the clean implementation. I took the time to review the source code for keycard-hardhat-provider, and I learned about how the Hardhat provider can be extended as a side effect of the import.

I tested the following configurations, and they worked as expected:

• Filling KEYCARD_ACCOUNT with the correct address.
• Filling KEYCARD_ACCOUNT with an incorrect address.
• Filling only the MNEMONIC.

The only thing that could be improved is the handling of EIP-55 checksums. I encountered this error when providing an address that satisfies checksum encoding (e.g., 0x46C6Ef8f5C3f13Ef35d94C4E7E0287b0cdbFCfa2). It appears the current implementation throws an error because it strictly expects a lowercase address.

[hiletmis]

Thanks a lot for the detailed review. I will add comply with eip-55 on keycard-hardhat-provider side