Enforce grace period restrictions

[tinker-michaelj]

Summary
HIP-16 stipulates a ledger-wide grace period between,

1. The time an entity expires; and,
2. The time it is permanently removed from the ledger.

An entity in its grace period is effectively "detached" from the ledger. It cannot participate in normal transactions.

In particular, a detached account cannot:

• Pay for a transaction or query.
• Be used in a CryptoTransfer.
• Be the target of a CryptoDelete.
• Be the receiver for a CryptoDelete.
• Be frozen or unfrozen for a token.
• Have KYC granted or revoked for a token.
• Be associated or dissociated from a token.
• Become or relinquish the treasury for a token.
• Mint/burn units as the extant treasury of a token.
• Have any property other than its expiration updated.
• Be designated the payer for a scheduled transaction.
• Receive funds during a ContractCreate or ContractCall.
• Acquire or relinquish autorenew responsibilities for a token or topic.

The only way to reattach an account is to perform a CryptoUpdate that extends its expiration past the current consensus time.

But,

• None of these restrictions apply unless autorenew.isEnabled=true.

Suggested resolution
Implement the above restrictions on detached accounts; return a failure code of ACCOUNT_EXPIRED_AND_PENDING_DELETION for any violating transaction or query when autorenew.isEnabled=true.