feat: update Tron methods to match Snap methods

[baptiste-marchand]

Related to: https://github.com/MetaMask/snap-tron-wallet/pull/124

Examples

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Note

Adds signMessage and signTransaction to TrxMethod and deprecates signMessageV2/verifyMessageV2.

• TRON types (packages/keyring-api/src/trx/types.ts):
  • TrxMethod enum: Add signMessage and signTransaction.
  • Mark signMessageV2 as deprecated (use signMessage), and verifyMessageV2 as deprecated/not supported.

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