i2c_slave_model invalid slave address will issue a error write

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Information:
Type :: BUG
Status :: OPENED
Assigned to :: nobody

Description:
in the ./bench/verilog/i2c_slave_model.v

If an invalid slave address is issue, the state is still in idle state, so it keep shifting in the sda.
Then a legal salve address maybe wrongly recognize and issue a write.

for this example code, 8'h22 is an invalid slave address,
start, 8'h22, 8'h00, 8'h00, 8'h00, 8'h00, stop
but this code will issue a write to memory 8'h20 with value 8'h20

I recommend to add a invalid_slave state, when an invalid slave address is issue,
it enter to this state, and wait for a start/stop to go back to idle mode.

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