feat: add logic for vechain token recoveries

[at31416]

This pull request adds support for VET token (specifically VTHO) recovery transactions using MPCv2 TSS, including both signed and unsigned sweep recoveries. It introduces a new recover method for VET tokens, updates the types and constants to support token contract addresses, and adds comprehensive tests and mocks for token recovery flows.

VET Token Recovery Support:

• Added a recover method to the VetToken class that supports both signed and unsigned sweep token recoveries using MPCv2 TSS, handling key derivation, transaction construction, signing, and broadcasting.
• Implemented a buildRecoveryTransaction method in VetToken to construct token recovery transactions, including fee estimation, balance checks, and clause creation for token transfers.

Type and Constant Updates:

• Extended RecoverOptions to include an optional tokenContractAddress for specifying the token contract in recovery operations.
• Added a feeEstimateData export to constants.ts for consistent fee calculation in token recovery.
• Updated imports and removed redundant local definitions to use the new shared feeEstimateData. [1] [2]
• Changed access modifiers in Vet to make fee calculation and recovery transaction building methods protected for subclass use. [1] [2]

Testing Improvements:

• Added unit tests to cover token recovery and unsigned sweep scenarios for VTHO using the new recovery logic.
• Introduced nockVetTokenRecovery in test mocks to simulate VET token recovery flows, including account balance, block info, and transaction submission.

Ticket: COIN-6042

[MohammedRyaan786]

LGTM

[MohammedRyaan786]

LGTM