feat: support parallel transactions instead of sequential

[Huygon764]

All tested flow:

• Create wallet (2 signers, threshold=2)
• Set threshold (2 -> 1)
• Add signer (signers=3)
• Remove signer (signers=2)
• Transfer ETH
• Batch ETH
• Transfer USDC
• Batch ETH + USDC

Advanced flow

1. Removed existed vote in tx:

• Create tx1 (remove signer A) (1/1)
• Create tx2 with approve from signerA (transfer) (1/1)
• Execute tx 1 (remove signer A)
• Approval signerA from tx2 is removed (0/1)

2. Increase threshold with pending Tx

• User A create tx1, A approve (1/1)
• Set threshold (1 -> 2) -> Execute
• Tx 1 need 2 approval
• User B approve -> Execute

3. Execute after add signer:

• User A create tx1, A approve (1/2)
• Add signer C -> Execute
• User B approve tx1 (2/2)
• Tx1 execute successful

4. Decrease threshold with pending Tx

• User A create tx1, A approve (1/2)
• Set threshold (2 -> 1) -> Execute
• Tx 1 just need 1 approval -> execute